US3364080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the corrosion resistance of chromate conversion coated aluminum surface
Assignee: Henkel Corp
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Filing: 1964-10-22
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Granted: 1968-01-16
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Expires: 1984-10-22
Abstract
No abstract record available.
Inventors
- 👤 Wilbur S Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:36
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE ART OF IMPROVING THE CORROSION RESISTANCE OF ALUMINUM SURFACES HAVING THEREON AN INTEGRAL, AMORPHOUS, CHEMICALLYU APPLIED, CHROMATE CONVERSION COATING; THE METHOD WHICH COMPRISES TREATING THE SAID COATED SURFACE WITH AN AQUEOUS ALKALINE SOLUTION CONSISTING ESSENTIALLY OF FROM 15 TO 100 GRAMS PER LITER OF A SOLUBLE HEXAVALENT CHROMIUM-CONTAINING COMPOUND, CALCULATED AS NA2CR2O7, MAINTAINING THE PH OF THE SOLUTION, AS MAY BE REQUIRED, AT FROM 8 TO 12 AND ITS TEMPERATURE AT NOT LESS THAN 65*C., AND CONTINUING THE TREATMENT UNTIL THE SOLUTION REACTS WITH THE SAID COATING SUFFICIENTLY TO INCREASE ITS CORROSION RESISTANCE.
Claim 2
Dependent Claim
95 words
IN THE ART OF IMPROVING THE CORROSION RESISTANCE OF ALUMINUM SURFACES HAVING THEREON AN INTEGRAL, AMORPHOUS, CHEMICALLYU APPLIED, CHROMATE CONVERSION COATING; THE METHOD WHICH COMPRISES TREATING THE SAID COATED SURFACE WITH AN AQUEOUS ALKALINE SOLUTION CONSISTING ESSENTIALLY OF FROM 15 TO 100 GRAMS PER LITER OF A SOLUBLE HEXAVALENT CHROMIUM-CONTAINING COMPOUND, CALCULATED AS NA2CR2O7, MAINTAINING THE PH OF THE SOLUTION, AS MAY BE REQUIRED, AT FROM 8 TO 12 AND ITS TEMPERATURE AT NOT LESS THAN 65*C., AND CONTINUING THE TREATMENT UNTIL THE SOLUTION REACTS WITH THE SAID COATING SUFFICIENTLY TO INCREASE ITS CORROSION RESISTANCE.
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) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |