US5497873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method employing an inlet extension for transporting and metering fine particulate and powdery material
Assignee: GE Energy USA LLC
•
Filing: 1993-12-08
•
Granted: 1996-03-12
•
Expires: 2013-12-08
Abstract
Abstract A solids pump apparatus for transporting and metering particulate material including a transport channel having an inlet and an outlet. The transport channel is formed between substantially opposed faces of first and second rotary discs movable between the inlet and outlet towards the outlet and at least one arcuate wall extending between the inlet and outlet. The apparatus further includes an inlet extension and a device provided adjacent the inlet extension for improving the flow of the fine and powdery particulate solids within the apparatus.
Inventors
- 👤 Andrew G. Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:16
CPC Classifications
B; B65; B65G; B65G31/00; B65G31/04; B65D; B65D88/00; B65D88/54; B65D88/64; B65D88/66
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
151 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough by gravity along the longitudinal axis toward the outlet; the generally tubular body having an axial length suitable for allowing the particulate material to become relatively compacted upon flowing through the hollow interior and into the transport channel of the particulate material transporting apparatus; wherein the generally hollow interior of the tubular body defines a radial cross-sectional area which diverges in the longitudinal direction toward the outlet.
Claim 2
Dependent Claim
151 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough by gravity along the longitudinal axis toward the outlet; the generally tubular body having an axial length suitable for allowing the particulate material to become relatively compacted upon flowing through the hollow interior and into the transport channel of the particulate material transporting apparatus; wherein the generally hollow interior of the tubular body defines a radial cross-sectional area which diverges in the longitudinal direction toward the outlet.
Claim 3
Dependent Claim
43 words
An inlet extension according to claim 1, further comprising: a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus.
Claim 4
Dependent Claim
33 words
An inlet extension according to claim 2, wherein the coupler comprises a flexible tubular extension portion for coupling the outlet of the tubular body to the inlet of the particulate material transporting apparatus.
Claim 5
Dependent Claim
109 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a vibrator coupled to the tubular body for torsionally vibrating the tubular body about its longitudinally directed axis.
Claim 6
Dependent Claim
109 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a vibrator coupled to the tubular body for torsionally vibrating the tubular body about its longitudinally directed axis.
Claim 7
Dependent Claim
59 words
An inlet extension according to claim 4, wherein the vibrator includes a vibrator supporting structure coupled to the vibrator and the tubular body for communicating to the tubular body vibrations directed torsionally about the axis of the tubular body and for minimizing the communication of vibrations to the tubular body directed parallel with the axis of the tubular body.
Claim 8
Dependent Claim
26 words
An inlet extension according to claim 5, wherein the vibrator supporting structure includes a ball ended rod assembly coupled to the vibrator and the tubular body.
Claim 9
Dependent Claim
22 words
An inlet extension according to claim 5, wherein the vibrator supporting structure includes a resilient suspension system for resiliently suspending the vibrator.
Claim 10
Dependent Claim
66 words
An inlet extension as recited in claim 4, further comprising at least one guide member coupling the vibrator to a first location on the generally tubular body, the first location being laterally offset from the longitudinally directed axis, for imparting substantially horizontally directed vibrations on the first location of the tubular body to effect torsional vibrations of the generally tubular body about the longitudinally directed axis.
Claim 11
Dependent Claim
35 words
An inlet extension as recited in claim 8, wherein the generally tubular body defines an exterior peripheral surface circumferencing the longitudinally directed axis and wherein said first location is disposed on said exterior peripheral surface.
Claim 12
Dependent Claim
68 words
An inlet extension as recited in claim 9, wherein the at least one guide member comprises first and second guide members, said first guide member coupled to said first location and said second guide member coupled to a second location on the external peripheral surface of the generally tubular body, said second location being substantially 180° offset from said first location with respect to the longitudinally directed axis.
Claim 13
Dependent Claim
99 words
An inlet extension as recited in claim 4, wherein: the generally tubular body defines an exterior peripheral surface circumferencing the longitudinally directed axis; the vibrator is coupled to a first location on the exterior peripheral surface of the generally tubular body; and the inlet extension further comprises a second vibrator coupled to a second location on the exterior peripheral surface of the generally tubular body, said second location being substantially 180° offset from said first location with respect to the longitudinally directed axis; and the two vibrators are configured to vibrate approximately 180° out of phase with each other.
Claim 14
Dependent Claim
146 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler includes a bearing assembly for supporting the tubular body for rotation about the axis of the tubular body.
Claim 15
Dependent Claim
146 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler includes a bearing assembly for supporting the tubular body for rotation about the axis of the tubular body.
Claim 16
Dependent Claim
162 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus: the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler comprises a flexible tubular extension portion for coupling the outlet of the tubular body to the inlet of the particulate material transporting apparatus; and wherein the flexible tubular extension portion has a bellows-like configuration.
Claim 17
Dependent Claim
162 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus: the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler comprises a flexible tubular extension portion for coupling the outlet of the tubular body to the inlet of the particulate material transporting apparatus; and wherein the flexible tubular extension portion has a bellows-like configuration.
Claim 18
Dependent Claim
133 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a material hopper having an outlet for supplying the particulate material to the transport channel through the tubular body of the inlet extension, and a generally flexible tubular extension portion for connecting the tubular extension to the outlet of the material hopper.
Claim 19
Dependent Claim
133 words
An inlet extension for an apparatus for transporting fine or powdery material, wherein the transporting apparatus has a particulate transport channel and an inlet provided in flow communication with the transport channel, the inlet extension comprising: a generally tubular body defining a longitudinally directed axis and a generally hollow interior having an outlet for arranging in flow communication with the inlet of the particulate material transporting apparatus; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the outlet; and a material hopper having an outlet for supplying the particulate material to the transport channel through the tubular body of the inlet extension, and a generally flexible tubular extension portion for connecting the tubular extension to the outlet of the material hopper.
Claim 20
Dependent Claim
17 words
An inlet extension according to claim 14, wherein the flexible tubular extension portion has a bellows-like configuration.
Claim 21
Dependent Claim
188 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior having an outlet in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough by gravity along the axis toward the inlet of the transport channel; and the generally tubular body having an axial length suitable for allowing the particulate material to become relatively compacted upon flowing through the hollow interior and into the transport channel; wherein the generally hollow interior of the tubular body defines a radial cross-sectional area which diverges in the longitudinal direction toward the outlet.
Claim 22
Dependent Claim
188 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior having an outlet in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough by gravity along the axis toward the inlet of the transport channel; and the generally tubular body having an axial length suitable for allowing the particulate material to become relatively compacted upon flowing through the hollow interior and into the transport channel; wherein the generally hollow interior of the tubular body defines a radial cross-sectional area which diverges in the longitudinal direction toward the outlet.
Claim 23
Dependent Claim
43 words
An inlet extension according to claim 16, further comprising: a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus.
Claim 24
Dependent Claim
43 words
An inlet extension according to claim 16, further comprising a shroud member assembly covering a portion of the moveable wall adjacent the inlet for inhibiting the moveable wall from imparting a force on the particulate material as the material passes through the inlet.
Claim 25
Dependent Claim
21 words
An inlet extension according to claim 16, wherein the tubular body has an internal wall provided with a low friction material.
Claim 26
Dependent Claim
13 words
An apparatus according to claim 19, wherein the low friction material is polytetrafluoroethylene.
Claim 27
Dependent Claim
149 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being Configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; and a vibrator coupled to the tubular body for torsionally vibrating the tubular body about its longitudinally directed axis.
Claim 28
Dependent Claim
149 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being Configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; and a vibrator coupled to the tubular body for torsionally vibrating the tubular body about its longitudinally directed axis.
Claim 29
Dependent Claim
59 words
An inlet extension according to claim 21, wherein the vibrator includes a vibrator supporting structure coupled to the vibrator and the tubular body for communicating to the tubular body vibrations directed torsionally about the axis of the tubular body and for minimizing the communication of vibrations to the tubular body directed parallel with the axis of the tubular body.
Claim 30
Dependent Claim
26 words
An inlet extension according to claim 22, wherein the vibrator supporting structure includes a ball ended rod assembly coupled to the vibrator and the tubular body.
Claim 31
Dependent Claim
22 words
An inlet extension according to claim 22, wherein the vibrator supporting structure includes a resilient suspension system for resiliently suspending the vibrator.
Claim 32
Dependent Claim
187 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler includes a bearing assembly for supporting the tubular body for rotation about the longitudinal axis of the tubular body.
Claim 33
Dependent Claim
187 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler includes a bearing assembly for supporting the tubular body for rotation about the longitudinal axis of the tubular body.
Claim 34
Dependent Claim
185 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler comprises a flexible tubular extension portion for coupling the outlet of the tubular body to the inlet.
Claim 35
Dependent Claim
185 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; and a coupler for coupling the generally tubular body to the inlet of the particulate material transporting apparatus to provide the hollow interior in flow communication with the inlet of the particulate material transporting apparatus; wherein the coupler comprises a flexible tubular extension portion for coupling the outlet of the tubular body to the inlet.
Claim 36
Dependent Claim
17 words
An inlet extension according to claim 26, wherein the flexible tubular extension portion has a bellows-like configuration.
Claim 37
Dependent Claim
172 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; a material hopper having an outlet for supplying the particulate material to the transport channel through the tubular body of the inlet extension; and a generally flexible tubular extension portion for connecting the tubular extension to the outlet of the material hopper.
Claim 38
Dependent Claim
172 words
An improved apparatus for transporting particulate material of the type having a movable wall structure defining a transport channel and having an inlet for receiving particulate material into the channel and an outlet for emitting particulate material from the channel, wherein the movable wall structure defines at least one wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the improvement comprising: an inlet extension having a longitudinally directed axis and a generally hollow interior in flow communication with the inlet of the transport channel; the generally hollow interior of the tubular body being configured to allow particulate material to pass therethrough along the axis toward the inlet of the transport channel; a material hopper having an outlet for supplying the particulate material to the transport channel through the tubular body of the inlet extension; and a generally flexible tubular extension portion for connecting the tubular extension to the outlet of the material hopper.
Claim 39
Dependent Claim
17 words
An inlet extension according to claim 28, wherein the flexible tubular extension portion has a bellows-like configuration.
Claim 40
Independent Claim
233 words
A method for transporting fine and powdery particulate material in an apparatus having a transport channel, an inlet for receiving particulate material into the transport channel, an outlet for emitting particulate material from the transport channel, at least one moveable wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the method comprising the steps of: coupling a generally hollow inlet extension to the transport channel inlet, the inlet extension having a predetermined vertical height and a generally hollow interior with a cross-sectional area that diverges in the direction toward the inlet of the transport channel; passing a volume of the powdery particulate material by gravity through the generally hollow inlet extension and into the inlet and transport channel; de-aerating the powdery particulate material within the inlet extension as the particulate material passes through the inlet extension so that the powdery particulate material becomes sufficiently compacted upon reaching the transport channel to form a transient solid for receiving a drive force from the at least one moveable wall; and engaging the transient solid with the at least one moveable wall such that the transient solid receives a drive force from the at least one moveable wall; transporting the transient solid toward the outlet with the drive force imparted by the at least one moveable wall.
Claim 41
Independent Claim
233 words
A method for transporting fine and powdery particulate material in an apparatus having a transport channel, an inlet for receiving particulate material into the transport channel, an outlet for emitting particulate material from the transport channel, at least one moveable wall moveable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on particulate material entering the channel from the inlet, the method comprising the steps of: coupling a generally hollow inlet extension to the transport channel inlet, the inlet extension having a predetermined vertical height and a generally hollow interior with a cross-sectional area that diverges in the direction toward the inlet of the transport channel; passing a volume of the powdery particulate material by gravity through the generally hollow inlet extension and into the inlet and transport channel; de-aerating the powdery particulate material within the inlet extension as the particulate material passes through the inlet extension so that the powdery particulate material becomes sufficiently compacted upon reaching the transport channel to form a transient solid for receiving a drive force from the at least one moveable wall; and engaging the transient solid with the at least one moveable wall such that the transient solid receives a drive force from the at least one moveable wall; transporting the transient solid toward the outlet with the drive force imparted by the at least one moveable wall.
Claim 42
Independent Claim
151 words
A method for transporting fine and powdery particulate material in an apparatus having a transport channel, an inlet for receiving particulate material into the transport channel, an outlet for emitting particulate material from the transport channel, at least one movable wall movable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on the particulate material entering the channel from the inlet, the method comprising the steps of: coupling a generally hollow inlet extension to the transport channel inlet, the inlet extension having a generally hollow interior and a longitudinal axis directed along the length of the generally hollow interior; passing a volume of particulate material through the generally hollow inlet extension and into the transport channel; torsionally vibrating the generally tubular body circumferentially about the longitudinally directed axis to reduce the effect of friction between the generally tubular body and the particulate material.
Claim 43
Independent Claim
151 words
A method for transporting fine and powdery particulate material in an apparatus having a transport channel, an inlet for receiving particulate material into the transport channel, an outlet for emitting particulate material from the transport channel, at least one movable wall movable in the direction from the inlet toward the outlet for imparting a force directed toward the outlet on the particulate material entering the channel from the inlet, the method comprising the steps of: coupling a generally hollow inlet extension to the transport channel inlet, the inlet extension having a generally hollow interior and a longitudinal axis directed along the length of the generally hollow interior; passing a volume of particulate material through the generally hollow inlet extension and into the transport channel; torsionally vibrating the generally tubular body circumferentially about the longitudinally directed axis to reduce the effect of friction between the generally tubular body and the particulate material.
Claim 44
Dependent Claim
68 words
A method as recited in claim 31, wherein said step of torsionally vibrating comprises the steps of: coupling a vibrator to the generally tubular body, at a location on the generally tubular body offset from the longitudinally directed axis; and operating the vibrator to impart generally horizontally directed vibrations to the laterally offset location on the generally tubular body to effect torsional vibrations of the generally tubular body.
References Cited (Backward Citations)
US1489571A
Cited
US1668183A
Cited
FR725012A
Cited
US2081182A
Cited
US2045081A
Cited
US2205902A
Cited
US2196390A
Cited
US2210505A
Cited
US2318881A
Cited
US2427659A
Cited
US2626571A
Cited
US2622722A
Cited
US2684870A
Cited
US2568536A
Cited
US2684872A
Cited
US2684873A
Cited
US2637375A
Cited
US2684868A
Cited
US2712412A
Cited
US2843047A
Cited
US2868351A
Cited
US3086696A
Cited
US3150815A
Cited
GB1220175A
Cited
US3643516A
Cited
US3592394A
Cited
US3765216A
Cited
US3889588A
Cited
US4076460A
Cited
GB1379075A
Cited
US4023784A
Cited
US4043445A
Cited
US4177005A
Cited
US4032254A
Cited
US4193737A
Cited
US4274527A
Cited
US4335994A
Cited
US4768920A
Cited
WO1980000472A1
Cited
US4773819A
Cited
US4409746A
Cited
US4516674A
Cited
US4597491A
Cited
US4616961A
Cited
US4678076A
Cited
US4832554A
Cited
US4972970A
Cited
US4988239A
Cited
US5051041A
Cited
US5137220A
Cited
US5356280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-12 | 1999-09-11 | 2000-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-12 | 2003-09-11 | 2004-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-12 | 2007-09-11 | 2008-03-12 | $7700.00 | Window Closed / Lapsed |