US2976193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and compositions for producing aluminum surface conversion coatings
Assignee: Purex Corp Ltd
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Filing: 1959-08-03
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Granted: 1961-03-21
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Expires: 1979-08-03
Abstract
No abstract record available.
Inventors
- 👤 George H Pimbley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
126 words
A PROCESS FOR PRODUCING A SUBSTANTIALLY COLORLESS CHEMICALLY BONDED COATING ON AN ALUMINUM ARTICLE, WHICH COMPRISES TREATING SAID ARTICLE WITH AN AQUEOUS ACID ALUMINUM CONVERSION COATING BATH, SAID BATH COMPRISING A HALOGEN-CONTAINING ANION, AN ANION INCLUDING A MEMBER OF THE GROUP CONSISTING OF HEXAVALENT CHROMIUM, MOLYBDENUM, TUNGSTEN AND FERRICYANIDE, A CATION OF THE GROUP CONSISTING OF ZINC, CADMIUM, MERCURY, VANADIUM, CHROMIUM, MANGANESE, IRON, COBALT, NICKEL AND COPPER, AND AN AGENT OF THE GROUP CONSISTING OF A SOLUBLE THIOCYANATE, A SOLUBLE CYANATE, THIOUREA, UREA, CYANURIC ACID, THIOCYANURIC ACID, SOLUBLE SULFUR-CONTAINING COMPOUNDS, SOLUBLE PHOSPHOROUS-CONTAINING COMPOUNDS, SOLUBLE FERROCYANIDES, SOLUBLE DIVALENT AND TRIVALENT CHROMIUM COMPOUNDS, HYDRO-QUINONE, QUINHYDRONE AND HYDRAZINES,AND FORMING A SUBSTANTIALLY COLORLESS CONVERSION COATING OF HIGH CORROSION RESISTANCE, THE PH OF SAID SOLUTION BEING ABOUT 1.5 TO ABOUT 3.5.
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) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |