US4063969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating aluminum with tannin and lithium
Assignee: MAN-GILL CHEMICAL COMPANY AN OH CORP
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Filing: 1976-02-09
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Granted: 1977-12-20
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Expires: 1996-02-09
Abstract
Abstract Disclosed are an improved composition and process for the treatment of aluminum surfaces for the purpose of imparting corrosion resistance and improved receptivity of an organic finish. A lithium compound is added to an aqueous tannin composition to obtain this effect.
Inventors
- 👤 John K. Howell, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:58
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/48; C23C22/56; C23C22/34; C23C22/68
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
41 words
An aqueous chromium-free concentrate composition comprising a vegetable tannin compound and a soluble lithium compound in an amount, at least 0.001 g/l, sufficient, when the concentrate is diluted for use, to improve the corrosion resistance of an aluminum surface treated therewith.
Claim 2
Dependent Claim
41 words
An aqueous chromium-free concentrate composition comprising a vegetable tannin compound and a soluble lithium compound in an amount, at least 0.001 g/l, sufficient, when the concentrate is diluted for use, to improve the corrosion resistance of an aluminum surface treated therewith.
Claim 3
Dependent Claim
11 words
The concentrate of claim 1 additionally containing a soluble titanium compound.
Claim 4
Dependent Claim
30 words
The concentrate of claim 2 wherein the titanium compound is selected from the group consisting of the ammonium or alkali metal-halide double salts, fluotitanic acid and titanium or titanyl sulfate.
Claim 5
Dependent Claim
13 words
The concentrate of claim 1 additionally containing a simple or complex fluoride compound.
Claim 6
Dependent Claim
10 words
The concentrate of claim 1 additionally containing a phosphate compound.
Claim 7
Dependent Claim
26 words
The concentrate of claim 1 wherein the lithium compound is selected from the group consisting of the oxide, hydroxide, nitrate, sulfate, chloride, fluoride and phosphate salts.
Claim 8
Dependent Claim
50 words
An aqueous chromium-free composition suitable for treating an aluminum surface to improve the corrosion resistance thereof comprising at least 0.00025 g/l of a vegetable tannin compound and a soluble lithium compound in an amount, at least 0.001 g/l, sufficient to improve the corrosion resistance of an aluminum surface treated therewith.
Claim 9
Dependent Claim
50 words
An aqueous chromium-free composition suitable for treating an aluminum surface to improve the corrosion resistance thereof comprising at least 0.00025 g/l of a vegetable tannin compound and a soluble lithium compound in an amount, at least 0.001 g/l, sufficient to improve the corrosion resistance of an aluminum surface treated therewith.
Claim 10
Dependent Claim
11 words
The composition of claim 7 additionally containing a soluble titanium compound.
Claim 11
Dependent Claim
13 words
The composition of claim 7 additionally containing a simple or complex fluoride compound.
Claim 12
Dependent Claim
10 words
The composition of claim 7 additionally containing a phosphate compound.
Claim 13
Dependent Claim
13 words
The composition of claim 7 wherein the pH is between 1 and 9.
Claim 14
Dependent Claim
21 words
A process for improving the corrosion resistance of an aluminum surface comprising contacting the surface with the composition of claim 7.
Claim 15
Dependent Claim
18 words
The process of claim 12 wherein the composition is maintained at a temperature of at least 90° F.
Claim 16
Dependent Claim
15 words
The process of claim 12 wherein the period of contact is at least 0.1 seconds.
References Cited (Backward Citations)
US2146838A
Cited
US2146840A
Cited
US2502441A
Cited
US2550328A
Cited
US2851385A
Cited
US2854368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |