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Patent US1720286A successfully refreshed from Google Patents.
US1720286A
Expired / Lapsed
US
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Process for the protection of the surface of baths of easily-oxidizable metals such as magnesium
Assignee: Individual
•
Filing: 1926-08-02
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Granted: 1929-07-09
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Expires: 1946-08-02
Abstract
No abstract record available.
Inventors
- 👤 Michel Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:50
CPC Classifications
C; C22; C22B; C22B26/00; C22B26/20; C22B26/22
Claims Analysis
Total Claims: 0
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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) | 1932-07-08 | 1933-01-07 | 1933-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-07-08 | 1937-01-07 | 1937-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-07-08 | 1941-01-07 | 1941-07-09 | $7700.00 | Window Closed / Lapsed |