Patent US2187712A successfully refreshed from Google Patents.
US3130086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Materials and method for use in applying chromate conversion coatings on zinciferous surfaces
Assignee: Henkel Corp
•
Filing: 1963-07-22
•
Granted: 1964-04-21
•
Expires: 1983-07-22
Abstract
No abstract record available.
Inventors
- 👤 George F Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:03
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 35 GRAMS/LITER OF HEXAVALENT CHROMIUM ION (CALCULATED AS CRO3), (C) FROM 0.05 TO 27 GRAMS/LITER OF SULFATE ION (CALCULATED AS SO4), AND (D) AT LEAST 0.15 GRAM/LITER OF A COMPLEX FLUORIDE RADICAL SELECTED FROM THE CLASS CONSISTING ESSENTIALLY OF TIF6, BF4, AND SIF6, SAID SOLUTION BEING SUBSTANTIALLY FREE OF ALKALI AND ALKALINE EARTH CATIONS AND BEING MAINTAINED AT A PH OF FROM 0.62 TO 2.5 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 |