US2494908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating ferriferous metals and zinciferous metals
Assignee: Henkel Corp
•
Filing: 1947-02-07
•
Granted: 1950-01-17
•
Expires: 1967-02-07
Abstract
No abstract record available.
Inventors
- 👤 Jr Frank Palin Spruance
- 👤 James H Thirsk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:02
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/34; C23C22/37; C23C22/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR COATING FERRIFEROUS AND ZINCIFEROUS METALS WHICH CONSISTS IN TREATING THE SURFACE WITH AN ACID AQUEOUS SOLUTION UNTIL A COATING IS FORMED; THE ESSENTIAL ACTIVE COATINGPRODUCING INGREDIENTS OF WHICH SOLUTION ARE FLURIDE ION, DICHROMATE ION, PHOSPHATE ION AND HYDROGEN ION, THE IONS BEING PRESENT IN AMOUNTS STOICHIOMETRICALLY EQUIVALENT TO
Claim 2
Dependent Claim
51 words
A PROCESS FOR COATING FERRIFEROUS AND ZINCIFEROUS METALS WHICH CONSISTS IN TREATING THE SURFACE WITH AN ACID AQUEOUS SOLUTION UNTIL A COATING IS FORMED; THE ESSENTIAL ACTIVE COATINGPRODUCING INGREDIENTS OF WHICH SOLUTION ARE FLURIDE ION, DICHROMATE ION, PHOSPHATE ION AND HYDROGEN ION, THE IONS BEING PRESENT IN AMOUNTS STOICHIOMETRICALLY EQUIVALENT TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |