US3871328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating chamber
Assignee: Individual
•
Filing: 1972-04-13
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Granted: 1975-03-18
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Expires: 1992-04-13
Abstract
Abstract A coating chamber having a drum shaped porous wall, rotatable to expose the wall alternately to pressure and suction is employed to create a powder cloud and collect powder not deposited on the article being coated. Powder so collected is re-blown into the cloud, without going thru a conventional collector system. The invention may be used without electrical charging of the wall, in the process wherein parts are preheated, or the wall may be electrically charged for the electrostatic coating process.
Inventors
- 👤 William P English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:07
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/02; B05C19/025; Y; Y10; Y10S; Y10S118/00; Y10S118/05
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
In a chamber for coating articles With powder, a rotatable cylinder having a porous circumferential wall, end rings attached to said wall, spacers separating said end rings and supporting said circumferential wall, a chamber for pressurized fluid external to and exposed to a sector of said wall, a chamber for suction of fluid external to and exposed to a sector of said wall, sealing means between said chambers for pressurized and suction fluids, and said end rings means to provide pressurized fluid to said chamber for pressurized fluid and means to provide suction to said chamber for suction of fluid, means for feeding powder into said cylinder, means for removing excess powder from said cylinder, means for conditioning excess powder and recirculating it back into said cylinder, walls enclosing said cylinder and chambers, said walls having openings for means to convey articles being coated into and out of said cylinder, and means for rotating said cylinder.
Claim 2
Dependent Claim
156 words
In a chamber for coating articles With powder, a rotatable cylinder having a porous circumferential wall, end rings attached to said wall, spacers separating said end rings and supporting said circumferential wall, a chamber for pressurized fluid external to and exposed to a sector of said wall, a chamber for suction of fluid external to and exposed to a sector of said wall, sealing means between said chambers for pressurized and suction fluids, and said end rings means to provide pressurized fluid to said chamber for pressurized fluid and means to provide suction to said chamber for suction of fluid, means for feeding powder into said cylinder, means for removing excess powder from said cylinder, means for conditioning excess powder and recirculating it back into said cylinder, walls enclosing said cylinder and chambers, said walls having openings for means to convey articles being coated into and out of said cylinder, and means for rotating said cylinder.
Claim 3
Dependent Claim
28 words
A coating chamber in accordance with claim 1 in which the wall is a conductive surface, and means for providing a high voltage electric current to said surface.
Claim 4
Dependent Claim
50 words
A coating chamber in accordance with claim 2 having a slip ring on one of said end rings, said slip ring connected to said conductive wall, a brush contacting said slip ring, said sealing means surrounding said slip ring and brush, a source of high voltage connected to said brush.
Claim 5
Dependent Claim
22 words
A coating chamber in accordance with claim 3 having means to provide pressurized fluid in the space confined by said sealing means.
Claim 6
Dependent Claim
43 words
A coating chamber in accordance with claim 1 having a grid spaced within the area enclosed by said circumferential wall, said grid being located so powder fluidized by said pressurized chamber will flow therethrough and being connected to a high voltage electric current.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |