Patent US3914461A successfully refreshed from Google Patents.
US3914461A
Expired / Lapsed
US
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Electrostatic coating method
Assignee: ELECTROSTATIC EQUIPMENT CORP
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Filing: 1974-02-04
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Granted: 1975-10-21
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Expires: 1994-02-04
Abstract
Abstract Objects are coated by passing them along a travel path adjacent a baffle, on the opposite side of which a cloud of electrostatically charged particles is generated, and across an elongated edge portion of which the charged particles may readily pass. Generally, at the beginning of the travel path the lower portions of the objects will be masked by the baffle so as to promote deposition of the particles upon the upper surfaces initially. As it proceeds along the travel path, progressive exposure of the lower portions of the object will permit the complete and uniform coating thereof.
Inventors
- 👤 William C Goodridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:28
CPC Classifications
B; B05; B05C; B05C19/00; B05C19/02; B05C19/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
IN A METHOD FOR ELECTROSTATICALLY COATING AN OBJECT, THE STEPS COMPRISING: GENERATING A CLOUD OF ELECTROSTATICALLY CHARGED PARTICLES ADJACENT ONE SIDE OF A GENERALLY UPSTANDING BAFFLE HAVING AN ELONGATED EDGE PORTION PWERMITTING READY PASSAGE THEREACROSS OF SAID CHARGED PARTICLES FROM SAID CLOUD, AND PASSING AT LEAST AN AXIAL PORTION OF AN OBJECT TO BE COATED LATERALLY ADJACENT THE OTHER SIDE OF SAID BAFFLE ALONG A PREDETER MINED TRAVEL PATH WHICH TRAVERSES THE IMAGINARY LATERALLYEXTENDING PROJECTION SURFACE OF SAID EDGE PORTION AT A NONPERPENDICULAR ANGLE THERETO, SAID BAFFLE INITIALLY BLOCKING FROM CONTACT BY SAID PARTICLES AT LEAST AXIAL PORTION OF THE OBJECT, AND CAUSING EXPOSURE OF PROGRESSIVELY LOWER VERTICAL PORTIONS THEREOF FOR CONTACT BY SAID PARTICLES DURING PASSAGE OF THE OBJECT ALONG SAID TRAVEL PATH THEREBY, SO AS TO DEVELOP A COATING ON SAID AXIAL PORTION ALONG AN AXIS THAT IS ANGULARLY DISPLACED FROM THE AXIS OF SAID TRAVEL PATH.
Claim 2
Dependent Claim
149 words
IN A METHOD FOR ELECTROSTATICALLY COATING AN OBJECT, THE STEPS COMPRISING: GENERATING A CLOUD OF ELECTROSTATICALLY CHARGED PARTICLES ADJACENT ONE SIDE OF A GENERALLY UPSTANDING BAFFLE HAVING AN ELONGATED EDGE PORTION PWERMITTING READY PASSAGE THEREACROSS OF SAID CHARGED PARTICLES FROM SAID CLOUD, AND PASSING AT LEAST AN AXIAL PORTION OF AN OBJECT TO BE COATED LATERALLY ADJACENT THE OTHER SIDE OF SAID BAFFLE ALONG A PREDETER MINED TRAVEL PATH WHICH TRAVERSES THE IMAGINARY LATERALLYEXTENDING PROJECTION SURFACE OF SAID EDGE PORTION AT A NONPERPENDICULAR ANGLE THERETO, SAID BAFFLE INITIALLY BLOCKING FROM CONTACT BY SAID PARTICLES AT LEAST AXIAL PORTION OF THE OBJECT, AND CAUSING EXPOSURE OF PROGRESSIVELY LOWER VERTICAL PORTIONS THEREOF FOR CONTACT BY SAID PARTICLES DURING PASSAGE OF THE OBJECT ALONG SAID TRAVEL PATH THEREBY, SO AS TO DEVELOP A COATING ON SAID AXIAL PORTION ALONG AN AXIS THAT IS ANGULARLY DISPLACED FROM THE AXIS OF SAID TRAVEL PATH.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein a multiplicity of objects are sequentially passed along said travel path for coating.
Claim 4
Dependent Claim
48 words
The method of claim 1 wherein said travel path extends between two of said baffles, and wherein a cloud of electrostatically charged particles is generated adjacent the outer side of each of the baffles to simultaneously effect particle contact upon opposite sides of the object during passage therealong.
Claim 5
Dependent Claim
52 words
The method of claim 1 wherein at least a second cloud of electrostatically charged particles is generated at a location spaced along said travel path from the location of said first-mentioned cloud, the particles of said second cloud having a charge of substantially different magnitude than the particles of said first-mentioned cloud.
Claim 6
Dependent Claim
39 words
The method of claim 1 including the additional step of heating the object subsequent to deposition of particles thereon, said particles being of a heat-fusible material and said heating step thereby producing a fused coating thereof upon the object.
Claim 7
Dependent Claim
16 words
The method of claim 2 wherein the objects are suspended during passage along said travel path.
Claim 8
Dependent Claim
34 words
The method of claim 1 wherein said edge portion slopes downwardly in the forward direction of said travel path and wherein said object is passed thereadjacent along a travel path that is substantially horizontal.
Claim 9
Dependent Claim
33 words
The method of claim 1 wherein said edge portion is substantially horizontal and wherein said object is passed thereadjacent along a travel path that is disposed at an angle to said edge portion.
Claim 10
Dependent Claim
20 words
The method of claim 1 wherein said object is rotated about a vertical axis during passage along said travel path.
Claim 11
Dependent Claim
37 words
The method of claim 1 wherein said step of generating a cloud of electrostatically charged particles comprises passing a stream of gas upwardly through a bed of particles to cause fluidization thereof, and electrostatically charging said particles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |