US3130085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and materials for applying chromate conversion coatings on zinciferous surfaces
Assignee: Henkel Corp
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Filing: 1963-06-04
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Granted: 1964-04-21
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Expires: 1983-06-04
Abstract
No abstract record available.
Inventors
- 👤 George F Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
THE METHOD OF FORMING A CHROMATE CONVERSION COATING ON A ZINCIFEROUS SURFACE WHICH COMPRISES SUBJECTING THE SURFACE TO THE ACTION OF AN AQUEOUS ACID SOLUTION CONSISTING ESSENTIALLY OF: (A) AT LEAST 3.0 GRAMS/LITER OF ZINC ION (CALCULATED AS ZN), (B) FROM 5.0 TO 75 GRAMS/LITER OF HEXAVALENT CHROMIUM ION (CALCULATED AS CRO3), (C) FROM 1 TO 20 GRAMS/LITER OF CHLORIDE ION (CALCULATED AS CL), AND (D) AT LEAST 1.0 GRAM/LITER OF A COMPLEX FLUORIDE RADICAL SELECTED FROM THE CLASS WHICH CONSISTS OF TIF6, BF4 AND SIF6, SAID SOLUTION BEING SUBSTANTIALLY FREE OF ALKALI AND ALKALINE EARTH CATIONS AND BEING MAINTAINED AT A PH OF FROM 0.57 TO 3.0 AND THE TREATMENT BEING CONTINUED UNTIL A CHROMATE CONVERSION COATING IS FORMED ON THE SURFACE.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |