Patent US3849207A successfully refreshed from Google Patents.
US3849207A
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Aluminum element having integral sepia surface and method therefor
Assignee: Convertex Ltd
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Filing: 1973-08-13
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Granted: 1974-11-19
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Expires: 1993-08-13
Abstract
Abstract Sepia-tone conversion/organic coatings on aluminum structural elements are obtained by altering the element surface by reaction with alkaline sodium formate solution, and coating the altered surface with a clear polymeric coating.
Inventors
- 👤 M Marosi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:26
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
66 words
METHOD OF FORMING SEPIA-TONE CONTINGS ON ALUMINUM STRUCTURAL ELEMENTS COMPRISING SURFACE REACTING THE ELEMENT FOR 10 TO 30 MINUTES IN A BATH AT A TEMPERATURE BETWEEN 170* AND 190*F, SAID BATH HAVING A PH OF BETWEEN 9 AND 10 AND CONSISTING ESSENTIALLY OF 0.1 TO 3 PERCENT BY WEIGHT ALKALI METAL FORMATE AND WATER; RINSING THE SURFACE, AND THEREAFTER OVERCOATING WITH A CLEAR, COLORLESS RESINOUS FILM.
Claim 2
Dependent Claim
66 words
METHOD OF FORMING SEPIA-TONE CONTINGS ON ALUMINUM STRUCTURAL ELEMENTS COMPRISING SURFACE REACTING THE ELEMENT FOR 10 TO 30 MINUTES IN A BATH AT A TEMPERATURE BETWEEN 170* AND 190*F, SAID BATH HAVING A PH OF BETWEEN 9 AND 10 AND CONSISTING ESSENTIALLY OF 0.1 TO 3 PERCENT BY WEIGHT ALKALI METAL FORMATE AND WATER; RINSING THE SURFACE, AND THEREAFTER OVERCOATING WITH A CLEAR, COLORLESS RESINOUS FILM.
Claim 3
Dependent Claim
26 words
Method according to claim 1 including also subjecting the surface reacted element to immersion in highly dilute aqueous nickel ion solution, prior to said overcoating step.
Claim 4
Dependent Claim
22 words
Method according to claim 2 in which said element is immersed in a 1 percent by weight solution of a nickel salt.
Claim 5
Dependent Claim
18 words
Method according to claim 1 in which the element surface is immersed in said bath for 10 minutes.
Claim 6
Dependent Claim
14 words
Method according to claim 1 in which the alkali metal formate is sodium formate.
Claim 7
Dependent Claim
23 words
Method according to claim 5 in which the concentration of sodium formate in the bath is between 0.5 and 1.5 percent by weight.
Claim 8
Dependent Claim
20 words
Method according to claim 6 in which the element surface is immersed in said bath for 10 to 15 minutes.
Claim 9
Dependent Claim
15 words
Method according to claim 7 in which the resinous film overcoating comprises synthetic organic polymer.
Claim 10
Dependent Claim
35 words
Method according to claim 8 in which the synthetic organic polymer comprises an acrylic or methacrylic acid or acid methyl or ethyl ester copolymer with an ethylenically unsaturated hydrocarbon containing up to eight carbon atoms.
Claim 11
Dependent Claim
27 words
Method according to claim 9 in which said element surface is immersed in an aqueous emulsion of said copolymer and dried with heating, to coat the surface.
Claim 12
Dependent Claim
31 words
Method according to claim 10 in which the sodium formate reacted surface is subjected to immersion in a 1 percent by weight nickel sulfate solution prior to overcoating with said copolymer.
Claim 13
Dependent Claim
15 words
Aluminum structural element having a sepia tone surface prepared by the method of claim 1.
Claim 14
Dependent Claim
15 words
Aluminum structural element having a sepia tone surface prepared by the method of claim 11.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |