Patent US1401937A successfully refreshed from Google Patents.
US1401937A
Expired / Lapsed
US
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Purification of maleic acid by reducing agents
Assignee: Barrett Co Inc
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Filing: 1920-11-09
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Granted: 1921-12-27
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Expires: 1940-11-09
Abstract
No abstract record available.
Inventors
- 👤 George C Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:25
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487
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) | 1924-12-26 | 1925-06-27 | 1925-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1928-12-26 | 1929-06-27 | 1929-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1932-12-26 | 1933-06-27 | 1933-12-27 | $7700.00 | Window Closed / Lapsed |