US2736640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical polishing bath
Assignee: FMC Corp
•
Filing: 1954-12-01
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Granted: 1956-02-28
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Expires: 1974-12-01
Abstract
No abstract record available.
Inventors
- 👤 Leslie D Mcgraw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:30
CPC Classifications
C; C23; C23F; C23F3/00; C23F3/02; C23F3/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
IN THE METHOD OF CHEMICALLY POLISHING ALUMINUM WITH A BATH CONTAINING PHOSPHORIC ACID AND HYDROGEN PEROXIDE, THE IMPROEVMENT WHICH COMPRISES HAVING PRESENT IN SAID BATH FROM ABOUT 1% TO ABOUT 3% OF GRAPHITIC CARBON.
Claim 2
Dependent Claim
34 words
IN THE METHOD OF CHEMICALLY POLISHING ALUMINUM WITH A BATH CONTAINING PHOSPHORIC ACID AND HYDROGEN PEROXIDE, THE IMPROEVMENT WHICH COMPRISES HAVING PRESENT IN SAID BATH FROM ABOUT 1% TO ABOUT 3% OF GRAPHITIC CARBON.
References Cited (Backward Citations)
FR491062A
Cited
US2613141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-02-27 | 1959-08-29 | 1960-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-27 | 1963-08-29 | 1964-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-27 | 1967-08-29 | 1968-02-28 | $7700.00 | Window Closed / Lapsed |