Patent US3622473A successfully refreshed from Google Patents.
US3622473A
Expired / Lapsed
US
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Method of providing aluminum surfaces with coatings
Assignee: Honny Chemicals Co Ltd
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Filing: 1969-09-25
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Granted: 1971-11-23
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Expires: 1989-09-25
Abstract
Abstract Aluminum articles are produced with a surface coating of highdurability by first electrolytically oxidizing the article in an acidic anodizing bath and after water washing, depositing the article in an aqueous dispersion, emulsion or solution of a thermosetting resin and passing a current through said article as the anode to cause electrodeposition of resin particles in the oxidized porous surface. The article is then heated to cure the resinous film.
Inventors
- 👤 Toshiyuki Ohta
- 👤 Hisashi Takao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:20
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
A method according to claim 1 wherein said electrolyte is an aqueous solution of an acid selected from the group consisting of sulphuric acid, oxalic acid and chromic acid.
Claim 2
Dependent Claim
25 words
A method according to claim 1 wherein the concentration of the resin in said aqueous dispersion, emulsion or solution is from 3 to 40 percent.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein a pigment or dye is incorporated into said resin dispersion, emulsion or solution.
Claim 4
Dependent Claim
23 words
A method according to claim 1 wherein the temperature of the resin dispersion, emulsion or solution is preferably maintained at 10*- 30* C.
Claim 5
Dependent Claim
10 words
An aluminum article produced by the method of claim 1.
Claim 6
Independent Claim
140 words
A method of producing an aluminum article having improved durability, comprising anodically oxidizing said article at about 20* C for about 1 hour in an electrolyte containing about 15 percent sulphuric acid and using a direct current of about 1.5 ma./dm.2 to form an anodized porous oxide film on the surface thereof; immediately after water washing, dipping said article in an aqueous dispersion, emulsion or solution of a thermosetting resin; passing through said article as anode a direct current having a voltage of 50- 100 volts and an initial current density of 200- 600 ma./dm.2, thereby electrodepositing resin particles on and in the anodized porous oxide film by electrophoresis and thereafter simultaneously curing the resin film and narrowing the pores of the oxide film to anchor the resin by heating the article at 120*- 160* C for 10- 60 minutes.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |