Patent US1831644A successfully refreshed from Google Patents.
US1831644A
Expired / Lapsed
US
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Dehydration and purification of co.
Assignee: Individual
•
Filing: 1930-11-13
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Granted: 1931-11-10
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Expires: 1950-11-13
Abstract
No abstract record available.
Inventors
- 👤 Sidney T Adair
- 👤 Charles F Cushing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:03
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; C; C01; C01B; C01B32/00; C01B32/50; Y; Y10; Y10S; Y10S62/00; Y10S62/928
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) | 1934-11-09 | 1935-05-11 | 1935-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-11-09 | 1939-05-11 | 1939-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-11-09 | 1943-05-11 | 1943-11-10 | $7700.00 | Window Closed / Lapsed |