US2173475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door-operating mechanism
Assignee: National Pneumatic Co Inc
•
Filing: 1935-11-30
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Granted: 1939-09-19
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Expires: 1955-11-30
Abstract
No abstract record available.
Inventors
- 👤 Paris R Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:23
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/53; E05Y; E05Y2201/00; E05Y2201/40; E05Y2201/43; E05Y2201/448; E05Y2800/00; E05Y2800/73; E05Y2900/00; E05Y2900/50; E05Y2900/51; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/188; Y10T74/18808; Y10T74/18816
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) | 1942-09-18 | 1943-03-20 | 1943-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-18 | 1947-03-20 | 1947-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-18 | 1951-03-20 | 1951-09-19 | $7700.00 | Window Closed / Lapsed |