Patent US2856322A successfully refreshed from Google Patents.
US2856322A
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Coated ferrous metal article and method of preparing same
Assignee: Pullman-Standard Car Manufacturing Co
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Filing: 1954-04-06
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Granted: 1958-10-14
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Expires: 1974-04-06
Abstract
No abstract record available.
Inventors
- 👤 Robert A Parson
- 👤 Truhlar John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:11
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/07; C23C22/23; Y; Y10; Y10T; Y10T428/00; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE METHOD OF PROVIDING A PERMANENT IRON PHOSPHATE COATING OF A WEIGHT IN EXCESS OF ONE HUNDRED MILLIGRAMS PER SQUARE FOOT ON A FERROUS METAL SURFACE, WHICH COMPRISES SUBJECTING THE METAL DEFINING THE SURFACE FOR A PERIOD OF FROM ABOUT ONE MINUTE TO ABOUT FORTY MINUTES TO THE ACTION OF A SOLUTION CONSISTING ESSENTIALLY OF A QUANTITY OF AN ACID PYROPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF THE SODIUM, POTASSIUM, LITHIUM, AMMONIUM, AND AMINE PYROPHOSPHATES AND MIXTURES THEREOF TO PROVIDE A CONCENTRATION OF PYROPOSPHATE IONS FROM ABOUT 0.5% TO ABOUT 5%, SAID SOLUTION HAVING A PH BETWEEN ABOUT 1 AND ABOUT 7 AND A TEMPERATURE BETWEEN ABOUT 130*F. AND ABOUT 200*F.
Claim 2
Independent Claim
111 words
THE METHOD OF PROVIDING A PERMANENT IRON PHOSPHATE COATING OF A WEIGHT IN EXCESS OF ONE HUNDRED MILLIGRAMS PER SQUARE FOOT ON A FERROUS METAL SURFACE, WHICH COMPRISES SUBJECTING THE METAL DEFINING THE SURFACE FOR A PERIOD OF FROM ABOUT ONE MINUTE TO ABOUT FORTY MINUTES TO THE ACTION OF A SOLUTION CONSISTING ESSENTIALLY OF A QUANTITY OF AN ACID PYROPHOSPHATE SELECTED FROM THE GROUP CONSISTING OF THE SODIUM, POTASSIUM, LITHIUM, AMMONIUM, AND AMINE PYROPHOSPHATES AND MIXTURES THEREOF TO PROVIDE A CONCENTRATION OF PYROPOSPHATE IONS FROM ABOUT 0.5% TO ABOUT 5%, SAID SOLUTION HAVING A PH BETWEEN ABOUT 1 AND ABOUT 7 AND A TEMPERATURE BETWEEN ABOUT 130*F. AND ABOUT 200*F.
References Cited (Backward Citations)
US2067007A
Cited
US2337856A
Cited
US2516685A
Cited
US2609308A
Cited
US2552874A
Cited
US2692189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |