Patent US2540314A successfully refreshed from Google Patents.
US2540314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and compositions for applying phosphate coatings
Assignee: Parker Rust Proof Co
•
Filing: 1947-07-24
•
Granted: 1951-02-06
•
Expires: 1967-07-24
Abstract
No abstract record available.
Inventors
- 👤 Amundsen Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:41
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/08; C23C22/22; C23C22/12; C23C22/18; C23C22/182; C23C22/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
111 words
THE METHOD OF COATING FERROUS METAL SURFACES WHICH COMPRISES IMMERSING A FERROUS METAL SURFACE INTO A SOLUTION CONSISTING ESSENTIALLY OF ZINC DIHYDROGEN PHOSPHATE, PHOSPHORIC ACID, ZINC CHLORIDE, WATER, AND A SOLUBLE CHLORIDE OTHER THAN ZINC, THE CHORIDE IN EXCESS OF THE CHLORIDE EQUIVALENT TO THE CHLORIDE OF THE ZINC CHLORIDE BEING PRESENT IN SOLUTION IN AT LEAST 1 GM. OF CHLORIDE PER 10 GMS. OF ZINC DIHYDROGEN PHOSPHATE, THE SOLUTION HAVING A FREE ACID TO TOTAL ACID RATIO OF BETWEEN 1:3.5 AND 1:20, A PH OF BETWEEN 1.5 AND 4.0, A ZINC CONCENTRATION OF AT LEAST .001 MOL. PER LITER AND A PHOSPHATE CONCENTRATION OF AT LEAST .003 MOL. PER LITER.
References Cited (Backward Citations)
US1514494A
Cited
US1869121A
Cited
US2137370A
Cited
US2132000A
Cited
US2209291A
Cited
US2314887A
Cited
US2316810A
Cited
CH229196A
Cited
US2293716A
Cited
US2351605A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |