US2806000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning stainless steel
Assignee: EIDP Inc
•
Filing: 1956-06-21
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Granted: 1957-09-10
•
Expires: 1976-06-21
Abstract
No abstract record available.
Inventors
- 👤 Michael A Streicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:39
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/04; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE METHOD OF CLEANING STAINLESS STEEL COMPRISING INCORPORATING IN AN AQUEOUS PHOSPHORIC ACID SOLUTION, IN CONCENTRATION UP TO AND INCLUDING ABOUT 85% BY WEIGHT PHOSPHORIC ACID, A FERRIC ION-CONTRIBUTING SALT OTHER THAN AN IRON HALIDE IN AN AMOUNT SUFFICIENT TO YIELD FROM ABOUT 1.0 TO 10.0 GRAMS PER LITER OF FERRIC IRON IN SAID SOLUTION, AND THEREAFTER CONTACTING SAID STAINLESS STEEL WITH SAID SOLUTION.
Claim 2
Independent Claim
64 words
THE METHOD OF CLEANING STAINLESS STEEL COMPRISING INCORPORATING IN AN AQUEOUS PHOSPHORIC ACID SOLUTION, IN CONCENTRATION UP TO AND INCLUDING ABOUT 85% BY WEIGHT PHOSPHORIC ACID, A FERRIC ION-CONTRIBUTING SALT OTHER THAN AN IRON HALIDE IN AN AMOUNT SUFFICIENT TO YIELD FROM ABOUT 1.0 TO 10.0 GRAMS PER LITER OF FERRIC IRON IN SAID SOLUTION, AND THEREAFTER CONTACTING SAID STAINLESS STEEL WITH SAID SOLUTION.
References Cited (Backward Citations)
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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) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |