US1901797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ejector
Assignee: COMMERCIAL PATENTS DEV Co
•
Filing: 1931-09-15
•
Granted: 1933-03-14
•
Expires: 1951-09-15
Abstract
No abstract record available.
Inventors
- 👤 Black Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:40
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/44; F04F5/46; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/237; B01F23/2376; B01F23/23767; B01F25/00; B01F25/30; B01F25/31; B01F25/312; B01F25/3124; B01F25/31241
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) | 1936-03-13 | 1936-09-12 | 1937-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-03-13 | 1940-09-12 | 1941-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-03-13 | 1944-09-12 | 1945-03-14 | $7700.00 | Window Closed / Lapsed |