Patent US2634225A successfully refreshed from Google Patents.
US2634225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ammonium chromate rinse for phosphate coated metal surfaces
Assignee: Henkel Corp
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Filing: 1950-06-21
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Granted: 1953-04-07
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Expires: 1970-06-21
Abstract
No abstract record available.
Inventors
- 👤 Harry J Benzing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:08
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE ART OF FINISHING FERRIFEROUS AND ZINCIFEROUS METAL SURFACES, THE METHOD WHICH INCLUDES PRODUCING ON THE SURFACE A CRYSTALLINE PHOSPHATE COATING BY CHEMICAL REACTION WITH THE METAL, RINSING THE COATED SURFACE WITH AN AQUEOUS SOLUTION CONTAINING AS ITS ESSENTIAL INGREDIENTS FOR EACH 100 GALLONS OF SOLUTION FROM 1 TO 40 OUNCES OF CHROMATE EXPRESSED AS CRO3 AND A QUANTITY OF AMMONIA SUFFICIENT TO YIELD A PH WHICH IS HIGH ENOUGH TO PRECLUDE THE PRESENCE OF FREE CHROMIC ACID, SAID RINSING SOLUTION BEING KEPT SUBSTANTIALLY FREE OF DISSOLVED EXTRANEOUS SALTS, DRYING THE RINSED SURFACE AND THEN APPLYING A SICCATIVE FINISHING COAT TO THE DRY SURFACE.
Claim 2
Dependent Claim
105 words
IN THE ART OF FINISHING FERRIFEROUS AND ZINCIFEROUS METAL SURFACES, THE METHOD WHICH INCLUDES PRODUCING ON THE SURFACE A CRYSTALLINE PHOSPHATE COATING BY CHEMICAL REACTION WITH THE METAL, RINSING THE COATED SURFACE WITH AN AQUEOUS SOLUTION CONTAINING AS ITS ESSENTIAL INGREDIENTS FOR EACH 100 GALLONS OF SOLUTION FROM 1 TO 40 OUNCES OF CHROMATE EXPRESSED AS CRO3 AND A QUANTITY OF AMMONIA SUFFICIENT TO YIELD A PH WHICH IS HIGH ENOUGH TO PRECLUDE THE PRESENCE OF FREE CHROMIC ACID, SAID RINSING SOLUTION BEING KEPT SUBSTANTIALLY FREE OF DISSOLVED EXTRANEOUS SALTS, DRYING THE RINSED SURFACE AND THEN APPLYING A SICCATIVE FINISHING COAT TO THE DRY 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) | 1956-04-06 | 1956-10-06 | 1957-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-06 | 1960-10-06 | 1961-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-06 | 1964-10-06 | 1965-04-07 | $7700.00 | Window Closed / Lapsed |