US3767474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing methods and compositions for aluminum oxide coatings
Assignee: Individual
•
Filing: 1971-09-22
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Granted: 1973-10-23
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Expires: 1991-09-22
Abstract
Abstract Methods and compositions are provided for dyeing and sealing, or sealing without dyeing, aluminum oxide coatings. Used for this purpose are aqueous compositions containing disodium 4dodecylated oxydibenzene sulfonate and one or more hydrolyzable metallic salts, typically of the metals Ni, Co, Pb, Sn, Al, Cr, Cu, Mn, Fe and Bi. If dyeing is to be effected, the dye is included in the sealing composition.
Inventors
- 👤 C Cohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:48
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/243; C25D11/246
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The method of claim 1 in which the hydrolyzable salt is a salt of nickel.
Claim 2
Independent Claim
65 words
The method of coating an aluminum surface comprising producing a porous aluminum oxide coating thereon and then sealing said coating with a hot aqueous solution containing DDOS in a concentration of at least about 0.01 grams per liter, a soluble hydrolyzable metallic salt in a concentration of at least about 0.1 gram per liter, and a dye compatible with the other constituents of said solution.
Claim 3
Dependent Claim
15 words
The method of claim 3 in which the hydrolyzable salt is a salt of nickel.
Claim 4
Dependent Claim
44 words
The method of claim 3 in which the aluminum is an alloy containing at least one metal which is oxidized in forming the coating to produce a colored coating, and in which the dye used has a color corresponding to that of the coating.
Claim 5
Dependent Claim
44 words
A bath for sealing a porous aluminum oxide coating on aluminum comprising an aqueous solution containing DDOS in a concentration of at least about 0.01 gram per liter and a hydrolyzable metallic salt in a concentration of at least about 0.1 gram per liter.
Claim 6
Dependent Claim
15 words
A bath according to claim 6 in which the hydrolyzable salt is a nickel salt.
Claim 7
Dependent Claim
21 words
A bath according to claim 6 in which there is also a dye compatible with the other constituents of the bath.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |