Patent US1990608A successfully refreshed from Google Patents.
US1990608A
Expired / Lapsed
US
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Apparatus for refining vapors
Assignee: Individual
•
Filing: 1933-11-22
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Granted: 1935-02-12
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Expires: 1953-11-22
Abstract
No abstract record available.
Inventors
- 👤 Lucas Owen David
- 👤 Lush Ernest Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:57
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01D53/0431; B01D53/0438; B01D53/0446; B01D2253/00; B01D2253/30; B01D2253/302; B01D2253/304
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) | 1938-02-11 | 1938-08-13 | 1939-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-02-11 | 1942-08-13 | 1943-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-02-11 | 1946-08-13 | 1947-02-12 | $7700.00 | Window Closed / Lapsed |