US4060648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface coating process
Assignee: Union Carbide Corp
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Filing: 1975-10-14
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Granted: 1977-11-29
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Expires: 1995-10-14
Abstract
Abstract A surface coating process which comprises passing a surface to be coated past or through an excited cloud of coating material on an alternating electric field between two electrodes, one of which comprises a rotating drum onto the surface of which is metered a supply of electrically chargeable coating particles.
Inventors
- 👤 Terence John Taylor-Brown
- 👤 Paul Newton Calver
- 👤 James Jack, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:11
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/007; B05B; B05B5/00; B05B5/08; B05B5/14; B05D1/28; B05D7/00; B05D7/02; B05D7/04; B41; B41M; B41M1/00; B41M1/42; C; C23; C23C; C23C24/00; B05D2252/00; B05D2252/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
82 words
A process for coating a surface with electrically chargeable particles of material, which comprises passing the surface to be coated through or past an excited cloud of coating material having a surface resistivity of less than 10 12 Ω or a volume resistivity of less than 10 11 Ω cm., the excited cloud having been formed in an alternating electric field between two electrodes, one of which comprises a rotating drum which carries a metered supply of the particles of coating material.
Claim 2
Dependent Claim
82 words
A process for coating a surface with electrically chargeable particles of material, which comprises passing the surface to be coated through or past an excited cloud of coating material having a surface resistivity of less than 10 12 Ω or a volume resistivity of less than 10 11 Ω cm., the excited cloud having been formed in an alternating electric field between two electrodes, one of which comprises a rotating drum which carries a metered supply of the particles of coating material.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1, wherein the surface to be coated is electrically conducting or is carried on an electrically conducting backing and itself forms the second electrode.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, wherein the surface to be coated is passed between two electrodes.
Claim 5
Dependent Claim
20 words
A process as claimed in claim 1, wherein the surface to be coated is the surface of a continuous web.
Claim 6
Dependent Claim
26 words
A process as claimed in claim 1, wherein the surface to be coated is oriented so that during bombardment by the particles it faces generally downwards.
Claim 7
Dependent Claim
25 words
A process as claimed in claim 1, wherein the particles in the excited cloud are caused to move in a generally upward and downward direction.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 1, wherein the surface to be coated is a metal surface.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 7, wherein the metal is selected from the group consisting of copper, aluminium, nickel and stainless steel.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 1, wherein the surface to be coated is a non-metal surface.
Claim 11
Dependent Claim
30 words
A process as claimed in claim 9, wherein the non-metal surface is selected from the group consisting of paper, textile fabric, rubber, natural plastic material and synthetic plastic material surfaces.
Claim 12
Dependent Claim
38 words
A process as claimed in claim 10, wherein the non-metal surface is a synthetic plastic material selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, linear polyester, polyurethane, polyepoxide, unsaturated polyester, phenylformaldehyde resin and cellulose acetate surfaces.
Claim 13
Dependent Claim
29 words
A process as claimed in claim 1, wherein one electrode is maintained at ground potential and the other electrode is connected to the means for applying the alternating voltage.
Claim 14
Dependent Claim
22 words
A process as claimed in claim 2, wherein the alternating voltage is applied to the rotatable drum which is otherwise electrically isolated.
Claim 15
Dependent Claim
19 words
A process as claimed in claim 1, wherein the particles have a surface resistivity less than 10 12 Ω.
Claim 16
Dependent Claim
20 words
A process as claimed in claim 1, wherein the particles have a volume resistivity less than 10 11 Ω cm.
Claim 17
Dependent Claim
14 words
A process as claimed in claim 1, wherein the particles comprise an inorganic material.
Claim 18
Dependent Claim
17 words
A process as claimed in claim 16, wherein the particles have at least a content of metal.
Claim 19
Dependent Claim
22 words
A process as claimed in claim 17, wherein the metal is selected from the group consisting of aluminium, brass, copper and silver.
Claim 20
Dependent Claim
26 words
A process as claimed in claim 17, wherein the particles comprise a core of a non-conductive material which is coated with a layer of a metal.
Claim 21
Dependent Claim
15 words
A process as claimed in claim 19, wherein the non-conducting core is a glass core.
Claim 22
Dependent Claim
15 words
A process as claimed in claim 16, wherein the particles are particles of sodium chloride.
Claim 23
Dependent Claim
15 words
A process as claimed in claim 1, wherein the particles comprise a synthetic plastics material.
Claim 24
Dependent Claim
35 words
A process as claimed in claim 22, wherein the plastics material is selected from the group consisting of a styrene/butadiene/acrylonitrile terpolymer, polymethyl methacrylate, polystyrene, a vinyl chloride polymer, an ethylene polymer and a phenolic resin.
References Cited (Backward Citations)
US3680779A
Cited
US3798048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |