Patent US2954309A successfully refreshed from Google Patents.
US2954309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for and method of coating ferrous metals
Assignee: Pennwalt Corp
•
Filing: 1956-08-17
•
Granted: 1960-09-27
•
Expires: 1976-08-17
Abstract
No abstract record available.
Inventors
- 👤 Charles M Swalm
- 👤 Spring Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:17
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/23
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PHOSPHATING COMPOSITION FOR FORMING PHOSPHATE COATINGS ON IRON, ZINC AND THEIR ALLOYS CONSISTING ESSENTIALLY OF A DIHYDROGEN PHOSPHATE OF THE GROUP CONSISTING OF SODIUM, POTASSIUM AND AMMONIUM DIHYDROGEN PHOSPHATE, AN ACID PYROPHOSPHATE OF THE GROUP CONSISTING OF SODIUM AND POTASSIUM ACID PYROPHOSPHATE AND A SMALL AMOUNT RELATIVE TO THE PROPORTIONS OF SAID FIRST TWO INGREDIENTS OF A SOLUBLE COMPOUND OF A METAL ION OF THE GROUP CONSISTING OF PENTAVALENT ARSENIC, TRIVALENT ARSENIC AND TRIVALENT CHROMIUM, THE AMOUNT OF SAID LAST MENTIONED INGREDIENT BEING EFFECTIVE TO IMPROVE THE CORROSION RESISTANCE OF THE PHOSPHATE COATINGS PRODUCED BY SAID COMPOSITION.
Claim 2
Dependent Claim
98 words
A PHOSPHATING COMPOSITION FOR FORMING PHOSPHATE COATINGS ON IRON, ZINC AND THEIR ALLOYS CONSISTING ESSENTIALLY OF A DIHYDROGEN PHOSPHATE OF THE GROUP CONSISTING OF SODIUM, POTASSIUM AND AMMONIUM DIHYDROGEN PHOSPHATE, AN ACID PYROPHOSPHATE OF THE GROUP CONSISTING OF SODIUM AND POTASSIUM ACID PYROPHOSPHATE AND A SMALL AMOUNT RELATIVE TO THE PROPORTIONS OF SAID FIRST TWO INGREDIENTS OF A SOLUBLE COMPOUND OF A METAL ION OF THE GROUP CONSISTING OF PENTAVALENT ARSENIC, TRIVALENT ARSENIC AND TRIVALENT CHROMIUM, THE AMOUNT OF SAID LAST MENTIONED INGREDIENT BEING EFFECTIVE TO IMPROVE THE CORROSION RESISTANCE OF THE PHOSPHATE COATINGS PRODUCED BY SAID COMPOSITION.
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) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |