US2834659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical polishing of metals
Assignee: EIDP Inc
•
Filing: 1957-03-25
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Granted: 1958-05-13
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Expires: 1977-03-25
Abstract
No abstract record available.
Inventors
- 👤 Owen B Mathre
- 👤 Donald M Sowards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:16
CPC Classifications
C; C23; C23F; C23F3/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
39 words
THE PROCESS OF POLISHING A METAL SURFACE WHICH COMPRISES CONTACTING THE SAME AT A TEMPERATURE OF 100* C. TO 110*C. WITH A SOLUTION CONTAINING 0.5 TO 3% MONOPERPHOSPHORIC ACID, 73% TO 79% PHOSPHORIC ACID, AND 20% TO 23% WATER.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |