US2509345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic door control
Assignee: Individual
•
Filing: 1947-06-19
•
Granted: 1950-05-30
•
Expires: 1967-06-19
Abstract
No abstract record available.
Inventors
- 👤 Edward N Howell
- 👤 D Arcy Ellis Wellington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:33
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/70; E05F15/77
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1934859A
Cited
US1855422A
Cited
US2012187A
Cited
US2294206A
Cited
US2203871A
Cited
US2411501A
Cited
US2426312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |