Patent US1940802A successfully refreshed from Google Patents.
US1940802A
Expired / Lapsed
US
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Control device for fractionators and the like
Assignee: Individual
•
Filing: 1929-12-09
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Granted: 1933-12-26
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Expires: 1949-12-09
Abstract
No abstract record available.
Inventors
- 👤 Floyd L Kallam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:19
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/4255
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) | 1936-12-25 | 1937-06-26 | 1937-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-12-25 | 1941-06-26 | 1941-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-12-25 | 1945-06-26 | 1945-12-26 | $7700.00 | Window Closed / Lapsed |