US2129937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil control device
Assignee: Individual
•
Filing: 1935-05-13
•
Granted: 1938-09-13
•
Expires: 1955-05-13
Abstract
No abstract record available.
Inventors
- 👤 Roy W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:03
CPC Classifications
F; F24; F24C; F24C5/00; F24C5/16; F23; F23D; F23D5/00; F23D5/12; F23D5/14; F24H; F24H9/00; F24H9/20; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7358; Y10T137/7404
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) | 1941-09-12 | 1942-03-14 | 1942-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-09-12 | 1946-03-14 | 1946-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-09-12 | 1950-03-14 | 1950-09-13 | $7700.00 | Window Closed / Lapsed |