US3645447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic paint spray system
Assignee: Electrogasdynamics Inc
•
Filing: 1968-12-31
•
Granted: 1972-02-29
•
Expires: 1988-12-31
Abstract
Abstract Electrostatic air atomized paint spray system and spray device wherein power for charging air atomized spray droplets and for maintaining electrostatic depositing field is obtained from selfcontained electrogasdynamic generator operatively responsive to the flow of seeded atomizing air therethrough.
Inventors
- 👤 Philip L Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:56
CPC Classifications
B; B05; B05B; B05B5/00; B05B5/025; B05B5/053; B05B5/0531; B05B5/03; B05B5/08; B05B5/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
152 words
A spray device for use in an electrostatic spray coating system wherein grounded articles are coated by having charged atomized spray particles electrostatically attracted toward and deposited thereon while still in the liquid state, comprising a source of pressurized air, means for selectively introducing seed material into the pressurized air, electrogasdynamic power generating means, first conduit means for directing at least a portion of the pressurized seeded air to said electrogasdynamic power generating means for passage therethrough for charging the atomized spray particles and for maintaining an electrostatic depositing field having one terminus adjacent the locus of atomization, means for atomizing liquid coating material by interaction with a high velocity gaseous stream and for projecting the atomized coating material as a spray of fine coating material particles, and second conduit means for directing at least a portion of the seeded air discharged from said electrogasdynamic power generating means to said atomizing means.
Claim 2
Dependent Claim
152 words
A spray device for use in an electrostatic spray coating system wherein grounded articles are coated by having charged atomized spray particles electrostatically attracted toward and deposited thereon while still in the liquid state, comprising a source of pressurized air, means for selectively introducing seed material into the pressurized air, electrogasdynamic power generating means, first conduit means for directing at least a portion of the pressurized seeded air to said electrogasdynamic power generating means for passage therethrough for charging the atomized spray particles and for maintaining an electrostatic depositing field having one terminus adjacent the locus of atomization, means for atomizing liquid coating material by interaction with a high velocity gaseous stream and for projecting the atomized coating material as a spray of fine coating material particles, and second conduit means for directing at least a portion of the seeded air discharged from said electrogasdynamic power generating means to said atomizing means.
Claim 3
Dependent Claim
18 words
A spray device according to claim 1 further comprising body means for carrying said electrogasdynamic power generating means.
Claim 4
Dependent Claim
20 words
A spray device according to claim 2 wherein said body means includes a forward portion formed substantially of insulating material.
Claim 5
Dependent Claim
27 words
A spray device according to claim 2 wherein said body means includes a bore and said generating means is selectively dimensioned for removable disposition within said bore.
Claim 6
Dependent Claim
57 words
A spray device as set forth in claim 1 wherein said electrogasdynamic power generating means has a voltage and current output of a magnitude dependent upon the magnitude of the delivery rate of said seeded atomizIng air for effecting proportional variations in the magnitude of the average depositing field strength of said electrostatic depositing field engendered thereby.
Claim 7
Dependent Claim
20 words
A spray gun as set forth in claim 5, wherein said electrogasdynamic power generating means generates direct current and voltage.
Claim 8
Dependent Claim
56 words
A device as set forth in claim 3 including spray charging discharge electrode means mounted at one end of said forward body portion and comprising at least a portion of said atomizing means electrically connected to the output of said electrogasdynamic power generating means for maintaining said ionized atmosphere in proximity to said atomized coating material.
Claim 9
Dependent Claim
33 words
The device as set forth in claim 7 including electrically isolated shielding electrode means disposed in spaced relation to said spray charging discharge electrode means for increasing the operating potential of the latter.
Claim 10
Dependent Claim
31 words
The device as set forth in claim 7 wherein said spray including charging discharge electrode means is selectively contoured to provide at least one corona inducing projection at the terminus thereof.
Claim 11
Dependent Claim
47 words
The device as set forth in claim 7 wherein said spray charging discharge electrode means is selectively contoured to provide at least one corona inducing projection at the terminus thereof and including electrically isolated shielding electrode means disposed in spaced relation thereto for increasing operating potential thereof.
Claim 12
Dependent Claim
43 words
The device as set forth in claim 8 wherein said shielding electrode means comprises a sleeve of conducting material disposed in surrounding spaced relation with said discharge electrode and having its forwardly directed end extending beyond the forward terminus of said discharge electrode.
Claim 13
Dependent Claim
43 words
The device as set forth in claim 10 wherein said shielding electrode means comprises a sleeve of conducting material disposed in surrounding spaced relation with said discharge electrode and having its forwardly directed end extending beyond the forward terminus of said discharge electrode.
Claim 14
Dependent Claim
39 words
The device as set forth in claim 7 wherein said spray charging discharge electrode means comprises liquid emitting nozzle portions of said atomizing means selectively contoured to provide at least one corona inducing surface discontinuity at the terminus thereof.
Claim 15
Dependent Claim
19 words
The device as set forth in claim 3 comprising an elongate needlelike member extending forwardly of said atomizing means.
Claim 16
Dependent Claim
33 words
The device as set forth in claim 14 including electrically isolated shielding electrode means disposed in spaced relation to said spray charging discharge electrode means for increasing the operating potential of the latter.
Claim 17
Dependent Claim
19 words
A device as set forth in claim 2 wherein said electrogasdynamic power generating means comprises a removably insertable cartridge.
Claim 18
Dependent Claim
38 words
The device as set forth in claim 2 including manually graspable support means mounted on the end of said body portion formed of conductive material and adapted to be grounded during operation of said electrogasdynamic voltage generating means.
References Cited (Backward Citations)
US3048498A
Cited
US3317138A
Cited
US3351285A
Cited
US3417267A
Cited
US3405291A
Cited
US3474266A
Cited
US3471089A
Cited
US3473735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |