US1789339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for distillation control
Assignee: Standard Oil Development Co
•
Filing: 1928-03-31
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Granted: 1931-01-20
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Expires: 1948-03-31
Abstract
No abstract record available.
Inventors
- 👤 Warren K Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:31
CPC Classifications
B; B01; B01D; B01D5/00; B01D5/0057; B01D5/006; B01D5/0063; B01D1/00; B01D1/0011; B01D1/0017; B01D3/00; B01D3/14; B01D3/143; B01D3/146; B01D3/42
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) | 1934-01-19 | 1934-07-21 | 1935-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-19 | 1938-07-21 | 1939-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-19 | 1942-07-21 | 1943-01-20 | $7700.00 | Window Closed / Lapsed |