Patent US3929286A successfully refreshed from Google Patents.
US3929286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for electrostatically spraying highly electrically conductive water-based coating material
Assignee: Nordson Corp
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Filing: 1975-01-29
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Granted: 1975-12-30
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Expires: 1995-01-29
Abstract
Abstract An electrostatic spray apparatus and method for spraying highly electrically conductive water-based coating material in which safety hazards are minimized. Included is a spray gun from which electrostatically charged water-based coating material is emitted toward an electrically grounded object to be coated; an enclosure of insulative material having upper and lower compartments electrically isolated from each other; a metallic coating supply container or tank located in the upper compartment for supplying coating material to the gun; an insulative hose interconnecting the tank and gun having a section thereof which passes through the lower compartment; a charging electrode located in the lower compartment in communication with the bore of the hose; a high voltage source connected to the charging electrode for charging the coating as it passes through the section of hose in the lower compartment; an opening in the upper compartment normally closed by a cover to facilitate access to the tank for replenishing the coating material; and a high voltage switch located in the lower compartment which is automatically actuated concomitantly with removal of the enclosure cover to electrically ground the charging electrode, and hence the system, thereby eliminating shock hazards when the tank is accessed for replenishment purposes and the like. Other features are also disclosed.
Inventors
- 👤 Donald R Hastings
- 👤 Jeffrey S Noss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:11
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/16; B05B5/1608
Claims Analysis
Total Claims: 47
Claim 1
Independent Claim
168 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged waterbased coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive waterbased coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging waterbased coating material in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, and means to electrically ground said charged coating material concomitantly with removal of said enclosure cover, thereby dissipating electrical energy stored in capacitive form in said system and in turn minimize electrical shock hazards upon removal of said cover to expose said coating container for access thereto.
Claim 2
Independent Claim
168 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged waterbased coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive waterbased coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging waterbased coating material in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, and means to electrically ground said charged coating material concomitantly with removal of said enclosure cover, thereby dissipating electrical energy stored in capacitive form in said system and in turn minimize electrical shock hazards upon removal of said cover to expose said coating container for access thereto.
Claim 3
Dependent Claim
53 words
The system of claim 1 wherein said electrical grounding means includes: an electrically grounded movable electrical conductor, and means to move said conductor concomitantly with removal of said cover from a first position physically displaced from said charged coating material to a second position in electrically conductive relation to said charged coating material.
Claim 4
Dependent Claim
53 words
The system of claim 2 wherein said enclosure includes a compartment electrically insulated from said container, said movable conductor being located within said compartment, and wherein said conductor moving means moves said conductor into electrically conductive relationship with said coating material concomitantly with removal of said cover to thereby electrically ground said system.
Claim 5
Dependent Claim
65 words
The system of claim 3 wherein said movable conductor includes a pivotally mounted electrically conductive rod within said compartment, and wherein said conductor moving means includes a movably mounted pin biased to project outwardly from said compartment through said enclosure proximate said opening, said pin moving outwardly to move said conductor into electrically conductive relation with said coating material only upon removal of said cover.
Claim 6
Independent Claim
220 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-bAsed coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material located in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, said enclosure further having a compartment electrically isolated from said container, a high voltage switch located in said compartment having one terminal connected to ground and another terminal connected in electrically conductive relation to said coating material, said switch being selectively operable between a first condition in which said terminals are electrically connected to ground said coating and a second condition in which said terminals are electrically disconnected, and an actuator for switching said switch to its first condition concomitantly with removal of said cover to ground said coating material and thereby dissipate energy stored in said system.
Claim 7
Independent Claim
220 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-bAsed coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material located in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, said enclosure further having a compartment electrically isolated from said container, a high voltage switch located in said compartment having one terminal connected to ground and another terminal connected in electrically conductive relation to said coating material, said switch being selectively operable between a first condition in which said terminals are electrically connected to ground said coating and a second condition in which said terminals are electrically disconnected, and an actuator for switching said switch to its first condition concomitantly with removal of said cover to ground said coating material and thereby dissipate energy stored in said system.
Claim 8
Independent Claim
228 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-based coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material located in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, said enclosure further having a compartment electrically insulated from said container through which a section of said fluid conduit passes, an electrode within said compartment, said electrode connected in said conduit section to physically contact waterbased coating material flowing therethrough from said container to said spray device, a high voltage switch located in said compartment selectively operable between a first condition in which said electrode is grounded and a second condition in which said electrode is ungrounded, and an actuator for switching said switch to its first condition concomitantly with removal of said cover to ground said electrode and thereby dissipate energy stored in said system.
Claim 9
Independent Claim
228 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-based coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material located in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, said enclosure further having a compartment electrically insulated from said container through which a section of said fluid conduit passes, an electrode within said compartment, said electrode connected in said conduit section to physically contact waterbased coating material flowing therethrough from said container to said spray device, a high voltage switch located in said compartment selectively operable between a first condition in which said electrode is grounded and a second condition in which said electrode is ungrounded, and an actuator for switching said switch to its first condition concomitantly with removal of said cover to ground said electrode and thereby dissipate energy stored in said system.
Claim 10
Dependent Claim
65 words
The system of claim 6 wherein said high voltage switch includes a movably mounted electrically grounded conductor, said conductor being movable, when said switch is in its first condition, to a first position in electrically conductive relation to said electrode to ground said system, and movable, when said switch is in its second condition, to a second position in electrically nonconductive relation to said electrode.
Claim 11
Dependent Claim
64 words
The system of claim 6 wherein said electrostatic charging source has a high voltage output electrically connected to said electrode for charging said water-based coating material as it flows through said conduit section in said compartment, said high voltage terminal being electrically connected to said container only through the highly conductive coating material located in said conduit section between said electrode and said container.
Claim 12
Dependent Claim
114 words
The system of claim 5 wherein a section of said fluid conduit passes through said switch compartment, wherein said system further includes: an electrode within said compartment, said electrode connected in said conduit section to physically contact wAter-based coating material flowing therethrough from said container to said spray device, and wherein said electrostatic charging source has a high voltage output electrically connected to said electrode for charging said water-based coating material as it flows through said conduit in said compartment, said high voltage terminal being electrically connected to said container via only one conductive path, said path including the highly conductive coating material located in said conduit section between said electrode and said container.
Claim 13
Dependent Claim
72 words
The apparatus of claim 1 further including: an electrical switch connected in electrical circuit with said charging source and mounted to said enclosure, said switch having first and second conditions in which said power supply is enabled and disabled, respectively, and an actuator responsive to movement of said cover to operate said switch between said first and second conditions in response to movement of said cover between closed and open positions, respectively.
Claim 14
Dependent Claim
103 words
The apparatus of claim 1 further including: a manually operated actuator mounted to said spray device for controlling the flow of coating material emitted from said spray device, an electrical switch connected in electrical circuit with said charging source, said switch having first and second conditions in which said electrostatic source is enabled and disabled, respectively, and an operator responsive to said manually operated actuator for operating said electrical switch between said first and second conditions for enabling and disabling said electrostatic source, respectively, in response to manual operation of said actuator to initiate and terminate coating emission from said spray device, respectively.
Claim 15
Dependent Claim
176 words
The apparatus of claim 1 further including: a first electrical switch connected in electrical circuit with said charging source and mounted to said enclosure, said switch having first and second conditions in which said power supply is enabled and disabled, respectively, a first actuator responsive to movement of said cover to operate said first switch between said first and second conditions in response to movement of said cover between closed and open positions, respectively, a manually operated second actuator mounted to said spray device for controlling the flow of coating material emitted from said spray device, a second electrical switch connected in electrical circuit with said charging source, said second switch having first and second conditions in which said electrostatic source is enabled and disabled, respectively, and an operator responsive to said manually operated second actuator for operating said second electrical switch between its first and second conditions for enabling and disabling said electrostatic source, respectively, in response to manual operation of said second actuator to initiate and terminate coating emission from said spray device, respectively.
Claim 16
Independent Claim
186 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-based coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, an electrical switch connected in electrical circuit with said charging source and mounted to said enclosure, sAid switch having first and second conditions in which said power supply is enabled and disabled, respectively, and an actuator responsive to movement of said cover to operate said switch between said first and second conditions in response to movement of said cover between closed and open positions, respectively.
Claim 17
Independent Claim
186 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-based coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, an electrical switch connected in electrical circuit with said charging source and mounted to said enclosure, sAid switch having first and second conditions in which said power supply is enabled and disabled, respectively, and an actuator responsive to movement of said cover to operate said switch between said first and second conditions in response to movement of said cover between closed and open positions, respectively.
Claim 18
Independent Claim
289 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-based coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, a first electrical switch connected in electrical circuit with said charging source and mounted to said enclosure, said switch having first and second conditions in which said power supply is enabled and disabled, respectively, a first actuator responsive to movement of said cover to operate said first switch between said first and second conditions in response to movement of said cover between closed and open positions, respectively, a manually operated second actuator mounted to said spray device for controlling the flow of coating material emitted from said spray device, a second electrical switch connected in electrical circuit with said charging source, said switch having first and second conditions in which said electrostatic source is enabled and disabled, respectively, and an operator responsive to said manually operated second actuator for operating said second electrical switch between its first and second conditions for enabling and disabling said electrostatic source, respectively, in response to manual operation of said second actuator to initiate and terminate coating emission from said spray device, respectively.
Claim 19
Independent Claim
289 words
A system for electrostatically spraying highly electrically conductive water-based paint with improved safety, comprising: a spray device for directing electrostatically charged water-based coating material toward an object to be coated which is maintained at a potential different from that of the charged coating material, a container for highly electrically conductive water-based coating material, a fluid conduit interconnecting said container and said spray device for transporting water-based coating material from said container to said spray device, a source of electrostatic charging potential for charging water-based coating material in said container, conduit and spray device, an electrically insulative enclosure surrounding said container, said enclosure having an opening therein provided with a removable cover to selectively expose and facilitate access to said coating container, a first electrical switch connected in electrical circuit with said charging source and mounted to said enclosure, said switch having first and second conditions in which said power supply is enabled and disabled, respectively, a first actuator responsive to movement of said cover to operate said first switch between said first and second conditions in response to movement of said cover between closed and open positions, respectively, a manually operated second actuator mounted to said spray device for controlling the flow of coating material emitted from said spray device, a second electrical switch connected in electrical circuit with said charging source, said switch having first and second conditions in which said electrostatic source is enabled and disabled, respectively, and an operator responsive to said manually operated second actuator for operating said second electrical switch between its first and second conditions for enabling and disabling said electrostatic source, respectively, in response to manual operation of said second actuator to initiate and terminate coating emission from said spray device, respectively.
Claim 20
Independent Claim
105 words
A method of electrostatic spraying in which safety hazards are minimized when replenishing a container with highly electrically conductive water-based coating material following electrostatic spraying of charged coating material from a spray device supplied from said container via a hose, said method comprising the steps of: enclosing the container with an insulative enclosure while spraying charged water-based coating material supplied to the spray device from said container via an electrically insulative hose, removing a cover from an opening in the enclosure to facilitate access to said container subsequent to termination of spraying, and electrically grounding the conductive coating material concomitantly with removal of the cover.
Claim 21
Independent Claim
105 words
A method of electrostatic spraying in which safety hazards are minimized when replenishing a container with highly electrically conductive water-based coating material following electrostatic spraying of charged coating material from a spray device supplied from said container via a hose, said method comprising the steps of: enclosing the container with an insulative enclosure while spraying charged water-based coating material supplied to the spray device from said container via an electrically insulative hose, removing a cover from an opening in the enclosure to facilitate access to said container subsequent to termination of spraying, and electrically grounding the conductive coating material concomitantly with removal of the cover.
Claim 22
Dependent Claim
36 words
The method of claim 15 wherein said grounding step includes: moving a grounded electrical conductor located within the enclosure into electrically conductive relationship with the coating material concomitantly with removing the cover when accessing the container.
Claim 23
Dependent Claim
37 words
The method of claim 15 further including the steps of: actuating an electrostatic power supply to charge the water-based coating material when spraying, and de-actuating the power supply concomitantly with removing the cover when accessing the container.
Claim 24
Dependent Claim
38 words
The method of claim 17 wherein said de-actuating step includes operating a switch mounted to the enclosure and in electrical circuit with the power supply, concomitantly with removing the cover when accessing the container via the enclosure opening.
Claim 25
Dependent Claim
40 words
The method of claim 15 further including the steps of: actuating an electrostatic power supply to charge the water-based coating material when spraying, and de-actuating the power supply concomitantly with terminating flow of the coating material to the spray device.
Claim 26
Dependent Claim
32 words
The method of claim 19 wherein said de-actuating step includes operating a first switch in electrical circuit with the power supply concomitantly with terminating flow of coating material to the spray device.
Claim 27
Dependent Claim
27 words
The method of claim 17 further including the step of: de-actuating the power supply concomitantly with terminating flow of the water-based coating material to the spray device.
Claim 28
Dependent Claim
63 words
The method of claim 17 wherein said de-actuating step includes: operating a first switch in electrical circuit with the power supply concomitantly with terminating flow of water-based coating material to the spray device, and operating a second switch mounted to the enclosure and in electrical circuit with the power supply concomitantly with removing the cover when accessing the container via the enclosure opening.
Claim 29
Independent Claim
119 words
A method of electrostatic spraying in which safety hazards are minimized when replenishing a container with highly electrically conductive water-based coating material following electrostatic spraying of charged coating material from a spray device supplied from said container via a hose, said method comprising the steps of: enclosing a container with an insulative enclosure while spraying charged water-based coating material supplied to the spray device from said container via an electrically insulative hose, actuating an electrostatic power supply to charge the water-based coating material when spraying, removing a cover from an opening in the enclosure to facilitate access to said container subsequent to termination of spraying, and de-actuating the power supply concomitantly with removing the cover when accessing the container.
Claim 30
Independent Claim
119 words
A method of electrostatic spraying in which safety hazards are minimized when replenishing a container with highly electrically conductive water-based coating material following electrostatic spraying of charged coating material from a spray device supplied from said container via a hose, said method comprising the steps of: enclosing a container with an insulative enclosure while spraying charged water-based coating material supplied to the spray device from said container via an electrically insulative hose, actuating an electrostatic power supply to charge the water-based coating material when spraying, removing a cover from an opening in the enclosure to facilitate access to said container subsequent to termination of spraying, and de-actuating the power supply concomitantly with removing the cover when accessing the container.
Claim 31
Dependent Claim
38 words
The method of claim 23 wherein said de-actuating step includes operating a switch mounted to the enclosure and in electrical circuit with the power supply concomitantly with removing the cover when accessing the container via the enclosure opening.
Claim 32
Dependent Claim
26 words
The method of claim 23 further including the step of: de-actuating the power supply concomitantly with terminating flow of the coating material to the spray device.
Claim 33
Dependent Claim
62 words
The method of claim 25 wherein said de-actuating step includes: operating a first switch in electrical circuit with the power supply concomitantly with terminating flow of coating material to the spray device, and operating a second switch mounted to the enclosure and in electrical circuit with the power supply concomitantly with removing the cover when accessing the container via the enclosure opening.
Claim 34
Dependent Claim
51 words
The method of claim 15 wherein said grounding step includes: closing a high voltage switch which is located within a compartment electrically isolated from said container enclosure, concomitantly with removing the cover, to thereby electrically connect the conductive coating material to ground potential and discharge electrical energy stored in the system.
Claim 35
Dependent Claim
80 words
The method of claim 27 further including the step of: transporting the water-based coating material from the container to the spray device via the hose along a path passing through said high voltage switch compartment, and said switch-closing step includes connecting to ground potential the conductive coating material flowing through the hose as the material passes through the high voltage switch compartment, thereby grounding the system through a switch in a compartment which is electrically isolated from the container enclosure.
Claim 36
Dependent Claim
66 words
The method of claim 28 further including the step of: energizing an electrode which is located in the switch compartment in physical contact with the material flowing through the section of the hose located in the switch compartment, said energization being with an electrostatic charging potential to Electrostatically charge the coating material flowing through the hose as the material passes through the high voltage switch compartment.
Claim 37
Dependent Claim
92 words
The method of claim 27 further including the steps of: transporting the water-based coating material from the container to the spray device via the hose along a path passing through said high voltage switch compartment, and energizing an electrode which is located in the switch compartment in physical contact with the material flowing through the section of the hose located in the switch compartment, said energization being with an electrostatic charging potential to electrostatically charge the coating material flowing through the hose as the material passes through the high voltage switch compartment.
Claim 38
Dependent Claim
152 words
The system of claim 1 wherein said fluid conduit has a bore through which coating material is transported from said container to said spray device, said conduit including: a. an inner zone surrounding said bore, said inner zone including material which is substantially chemically inert and impermeable to said water-based coating material, and b. an outer zone of dielectric material surrounding said inner zone, said outer zone having an outer surface substantially free of electrically conductive material to minimize the capacitance of the conduit, and hence the electrical energy stored in the conduit in capacitive form, when the conduit is physically spaced from a grounded object, said inner and outer zones having dielectric constants and radial thicknesses to avoid dielectric breakdown therein when subjected to a potential difference equal to the difference in potential between ground potential and the potential existing at the interface of the transported coating and the inner zone.
Claim 39
Dependent Claim
100 words
The system of claim 1 wherein said fluid conduit is hollow, said conduit having a dielectric wall with a zone in contact with the water-based coating which is substantially chemically inert and impermeable to the coating, said wall constructed to withstand dielectric breakdown when subjected to an electrical potential by electrostatically charged coating material in said conduit, said conduit having an exterior surface which is substantially free of electrically conductive material to minimize the capacitance of the conduit, and hence the electrical energy stored in the conduit in capacitive form, when the conduit is physically spaced from a grounded object.
Claim 40
Dependent Claim
154 words
The system of claim 5 wherein said fluid conduit has a bore through which coating material is transported from said container to said spray device, said conduit including: a. an inner zone surrounding said bore, said inner zone including material which is substantially chemically inert and impermeable to said water-based coating material, and b. an outer zone of dielectric material surrounding said inner zone, said outer zone having an exterior surface which is substantially free of electrically conductive material to minimize the capacitance of the conduit, and hence the electrical energy stored in the conduit in capacitive form, when the conduit is physically spaced from a grounded object, said inner and outer zones having dielectric constants and radial thicknesses to avoid dielectric breakdown therein when subjected to a potential difference equal to the difference in potential between ground potential and the potential existing at the interface of the transported coating and the inner zone.
Claim 41
Dependent Claim
99 words
The system of claim 5 wherein said fluid conduit is hollow, said conduit having a dielectric wall with a zone in contact with the coating which is substantially chemically inert and impermeable to the coating, said wall constructed to withstand dielectric breakdown when subjected to an electrical potential by electrostatically charged coating material in said conduit, said conduit having an exterior surface which is substantially free of electrically conductive material to minimize the capacitance of the conduit, and hence the electrical eneRgy stored in the conduit in capacitive form, when the conduit is physically spaced from a grounded object.
Claim 42
Dependent Claim
152 words
The system of claim 9 wherein said fluid conduit has a bore through which coating material is transported from said container to said spray device, said conduit including: a. an inner zone surrounding said bore, said inner zone including material which is substantially chemically inert and impermeable to said coating material, b. an outer zone of dielectric material surrounding said inner zone, said outer zone having an exterior surface which is substantially free of electrically conductive material to minimize the capacitance of the conduit, and hence the electrical energy stored in the conduit in capacitive form, when the conduit is physically spaced from a grounded object, said inner and outer zones having dielectric constants and radial thicknesses to avoid dielectric breakdown therein when subjected to a potential difference equal to the difference in potential between ground potential and the potential existing at the interface of the transported coating and the inner zone.
Claim 43
Dependent Claim
99 words
The system of claim 9 wherein said fluid conduit is hollow, said conduit having a dielectric wall with a zone in contact with the coating which is substantially chemically inert and impermeable to the coating, said wall constructed to withstand dielectric breakdown when subjected to an electrical potential by electrically charged coating material in said conduit, said conduit having an exterior surface which is substantially free of electrically conductive material to minimize the capacitance of the conduit, and hence the electrical energy stored in the conduit in capacitive form, when the conduit is physically spaced from a grounded object.
Claim 44
Dependent Claim
51 words
The system of claim 1 wherein said spray device further includes means for controlling the flow of coating material to said spray device, and wherein said electrical grounding means is operative to ground said system when said coating material flow is continuously stopped for a time period exceeding a predetermined interval.
Claim 45
Dependent Claim
17 words
The system of claim 37 wherein said predetermined interval is in the approximate range of 1-6 seconds.
Claim 46
Dependent Claim
61 words
The system of claim 5 further including: manually operated means for controlling the flow of coating material to said spray device, and a second actuator for switching said switch to its first condition, to thereby ground said electrode and dissipate energy stored in said system, when said coating material flow is continuously stopped for a time period exceeding a predetermined interval.
Claim 47
Dependent Claim
61 words
The system of claim 8 further including: manually operated means for controlling the flow of coating material to said spray device, and a second actuator for switching said switch to its first condition, to thereby ground said electrode and dissipate energy stored in said system, when said coating material flow is continuously stopped for a time period exceeding a predetermined interval.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |