Patent US2643204A successfully refreshed from Google Patents.
US2643204A
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Nitric acid pickling
Assignee: Bethlehem Steel Corp
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Filing: 1948-10-01
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Granted: 1953-06-23
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Expires: 1968-10-01
Abstract
No abstract record available.
Inventors
- 👤 Edgar B Mancke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:13
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
IN A PROCESS FOR TREATING A USED NITRIC ACID PICKLING SOLUTION CONTAINING FERRIC NITRATE AND A SUBSTANTIAL AMOUNT OF FREE NITRIC ACID, THE STEP OF AUTOCLAVING THE SOLUTION AT A TEMPERATURE OF NOT LESS THAN 340* F. TO PRODUCE AN INSOLUBLE FERRIC COMPOUND AND TO FORM AND RETAIN FREE NITRIC ACID IN SAID SOLUTION.
Claim 2
Dependent Claim
54 words
IN A PROCESS FOR TREATING A USED NITRIC ACID PICKLING SOLUTION CONTAINING FERRIC NITRATE AND A SUBSTANTIAL AMOUNT OF FREE NITRIC ACID, THE STEP OF AUTOCLAVING THE SOLUTION AT A TEMPERATURE OF NOT LESS THAN 340* F. TO PRODUCE AN INSOLUBLE FERRIC COMPOUND AND TO FORM AND RETAIN FREE NITRIC ACID IN SAID SOLUTION.
References Cited (Backward Citations)
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Cited
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Cited
US2344004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |