Patent US6458158B1 successfully refreshed from Google Patents.
US4470853A
Expired / Lapsed
US
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Coating compositions and method for the treatment of metal surfaces
Assignee: CORAL CHEMICAL COMPANY A CORP OF
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Filing: 1983-10-03
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Granted: 1984-09-11
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Expires: 2003-10-03
Abstract
Abstract An aqeuous acidic composition provides improved coating for aluminum. The composition comprises from about 10 to about 150 ppm zirconium, from about 20 to about 250 ppm fluoride, from about 30 to about 125 ppm tannin, from about 15 to about 100 ppm phosphate and from about 5 to about 50 ppm zinc, said coating solution having a tannin to phosphate ratio in the range of at least about 1:1 to about 2:1 and a pH in the range of about 2.3 to about 2.95.
Inventors
- 👤 Narayan Das
- 👤 Peter M. Stastny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:55
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/36; C23C22/362
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
85 words
A non-chromate coating solution effective in forming a coating on aluminum comprising: from about 10 to about 150 ppm zirconium, from about 20 to about 250 ppm fluoride, from about 30 to about 125 ppm tannin, from about 15 to about 100 ppm phosphate and from about 5 to about 50 ppm zinc, said coating solution having a tannin to phosphate ratio in the range of at least about 1:1 to about 2:1 and a pH in the range of about 2.3 to about 2.95.
Claim 2
Dependent Claim
85 words
A non-chromate coating solution effective in forming a coating on aluminum comprising: from about 10 to about 150 ppm zirconium, from about 20 to about 250 ppm fluoride, from about 30 to about 125 ppm tannin, from about 15 to about 100 ppm phosphate and from about 5 to about 50 ppm zinc, said coating solution having a tannin to phosphate ratio in the range of at least about 1:1 to about 2:1 and a pH in the range of about 2.3 to about 2.95.
Claim 3
Dependent Claim
73 words
A non-chromate coating solution as recited in claim 1 wherein said coating solution is effective in forming a coating to impart corrosion resistance to an aluminum surface, said coating solution comprising from about 40 to about 80 ppm zirconium, from about 50 to about 200 ppm fluoride, from about 40 to about 80 ppm tannin, from about 25 ppm to about 50 ppm phosphate and from about ppm to about 25 ppm zinc.
Claim 4
Dependent Claim
25 words
A non-chromate coating solution as recited in claim 2 wherein said coating solution has a pH in the range of about 2.5 to about 2.9.
Claim 5
Dependent Claim
21 words
A non-chromate coating solution as recited in claim 2 wherein said coating has a tannin to phosphate ratio of about 1.5:1.
Claim 6
Dependent Claim
25 words
A non-chromate coating solution as recited in claim 4 wherein said coating solution has a pH in the range of about 2.5 to about 2.9.
Claim 7
Dependent Claim
100 words
A non-chromate process for forming a corrosion resistant paint receptive coating on an aluminum surface comprising contacting the aluminum surface with a treatment composition having a pH from about 2.3 to about 2.95, said treatment composition comprising from about 10 ppm to about 150 ppm zirconium, from about 20 ppm to about 250 ppm fluoride, from about 30 ppm to about 125 ppm tannin, from about 15 ppm to about 100 ppm phosphate and from about 5 ppm to about 50 ppm zinc, said composition having a tannin to phosphate ratio in the range of about 1:1 to about 2:1.
Claim 8
Dependent Claim
100 words
A non-chromate process for forming a corrosion resistant paint receptive coating on an aluminum surface comprising contacting the aluminum surface with a treatment composition having a pH from about 2.3 to about 2.95, said treatment composition comprising from about 10 ppm to about 150 ppm zirconium, from about 20 ppm to about 250 ppm fluoride, from about 30 ppm to about 125 ppm tannin, from about 15 ppm to about 100 ppm phosphate and from about 5 ppm to about 50 ppm zinc, said composition having a tannin to phosphate ratio in the range of about 1:1 to about 2:1.
Claim 9
Dependent Claim
25 words
A process as recited in claim 6 wherein said treatment is at a temperature in thee range of about 80° F. to about 120° F.
Claim 10
Dependent Claim
26 words
A process as recited in claim 6 wherein said treatment composition is at a temperature in the range of about 90° F. to about 110° F.
Claim 11
Dependent Claim
33 words
A process as recited in claim 8 wherein contacting the aluminum surface with said treatment composition comprises spraying said treatment composition onto the aluminum surface for about 10 seconds to about 60 seconds.
Claim 12
Dependent Claim
58 words
A process as recited in claim 6 wherein said treatment composition comprises from about 40 ppm to about 80 ppm zirconium, from about 50 ppm to about 200 ppm fluoride, from about 40 ppm to about 80 ppm tannin, from about 25 ppm to about 50 ppm phosphate and from about 10 ppm to about 25 ppm zinc.
Claim 13
Dependent Claim
23 words
A process as recited in claim 10 wherein said treatment composition has a pH in the range of about 2.5 to about 2.9.
Claim 14
Dependent Claim
20 words
A process as recited in claim 10 wherein said treatment composition has a tannin to phosphate ratio of about 1.5:1.
Claim 15
Dependent Claim
23 words
A process as recited in claim 12 wherein said treatment composition has a pH in the range of about 2.5 to about 2.9.
Claim 16
Dependent Claim
26 words
A process as recited in claim 13 wherein said treatment composition is at a temperature in the range of about 90° F. to about 110° F.
Claim 17
Dependent Claim
32 words
A process as recited in claim 14 wherein contacting the aluminum surface with said treatment composition comprises spraying the aluminum surface with said treatment composition for about 10 to about 60 seconds.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |