US2909455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating a succession of aluminum surfaces
Assignee: Henkel Corp
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Filing: 1958-09-24
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Granted: 1959-10-20
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Expires: 1978-09-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Nelson J Newhard
- 👤 David Y Dollman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:49
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37; C23C22/38; C23C22/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN THE ART OF COATING A SERIES OF ALUMINUM PIECES WHEREIN THE SURFACES THEREOF ARE TREATED SUCCESSIVELY WITH AN AQUEOUS ACID BATH THE COATING PRODUCING INGREDIENTS OF WHICH CONSIST ESSENTIALLY OF FLUORIDE, HEXAVALENT CHROMIUM, PHOSPHATE AND HYDROGEN IONS; THE METHOD OF CONTROLLING THE COMPOSITION OF THE BATH WHICH COMPRISES CONSTANTLY WITHDRAWING A PORTION OF THE BATH, PASSING IT THROUGH A CATION EXCHANGE RESIN AND RETURNING IT TO THE BATH; MAINTAINING THE FLUORIDE ACTIVITY OF THE BATH BY PERIODICALLY ADDING THERETO AT LEAST 1 MOL OF SODIUM FLUORIDE AND 2 MOLS OF POTASSIUM FLUORIDE FOR EACH MOL OF ALUMINUM DISSOLVED IN THE BATH; AND MAINTAINING THE HEXAVALENT CHROMIUM, THE PHOSPHATE AND THE HYDROGEN ION CONTENT BY SUITABLE ADDITIONS AS MAY BE REQUIRED.
Claim 2
Dependent Claim
121 words
IN THE ART OF COATING A SERIES OF ALUMINUM PIECES WHEREIN THE SURFACES THEREOF ARE TREATED SUCCESSIVELY WITH AN AQUEOUS ACID BATH THE COATING PRODUCING INGREDIENTS OF WHICH CONSIST ESSENTIALLY OF FLUORIDE, HEXAVALENT CHROMIUM, PHOSPHATE AND HYDROGEN IONS; THE METHOD OF CONTROLLING THE COMPOSITION OF THE BATH WHICH COMPRISES CONSTANTLY WITHDRAWING A PORTION OF THE BATH, PASSING IT THROUGH A CATION EXCHANGE RESIN AND RETURNING IT TO THE BATH; MAINTAINING THE FLUORIDE ACTIVITY OF THE BATH BY PERIODICALLY ADDING THERETO AT LEAST 1 MOL OF SODIUM FLUORIDE AND 2 MOLS OF POTASSIUM FLUORIDE FOR EACH MOL OF ALUMINUM DISSOLVED IN THE BATH; AND MAINTAINING THE HEXAVALENT CHROMIUM, THE PHOSPHATE AND THE HYDROGEN ION CONTENT BY SUITABLE ADDITIONS AS MAY BE REQUIRED.
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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |