US3063877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and solutions for treating metal surfaces
Assignee: Henkel Corp
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Filing: 1960-10-10
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Granted: 1962-11-13
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Expires: 1980-10-10
Abstract
No abstract record available.
Inventors
- 👤 Schiffman Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:38
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/82; C23C22/83; C23C22/05; C23C22/06; C23C22/24; C23C22/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
THE METHOD OF IMPROVING ALKALI METAL PHOSPHATE COATINGS WHICH COMPRISES REACTING AN AQUEOUS ACID SOLUTION CONTAINING FROM ABOUT 50 TO ABOUT 800 GRAMS PER LITER OF HEXAVALENT CHROMIUM EXPRESSED AS CRO3 WITH FORMALDEHYDE WHEREBY FORM ABOUT 5 PERCENT TO ABOUT 60 PERCENT OF THE CHROMIUN IS REDUCED, DILUTING THE RESULTING SOLUTION WITH SUFFICIENT WATER TO YIELD A SOLUTION CONTAINING FROM ABOUT 0.15 GRAM PER LITER TO ABOUT 10 GRAMS PER LITER OF TOTAL CHROMIUM AND RINSING SAID COATING WITH SAID DILUTED SOLUTION.
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) | 1965-11-12 | 1966-05-14 | 1966-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-12 | 1970-05-14 | 1970-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-12 | 1974-05-14 | 1974-11-13 | $7700.00 | Window Closed / Lapsed |