US1990898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door shaft construction
Assignee: National Pneumatic Co Inc
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Filing: 1933-11-18
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Granted: 1935-02-12
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Expires: 1953-11-18
Abstract
No abstract record available.
Inventors
- 👤 Paris R Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
E; E05; E05D; E05D5/00; E05D5/10; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/53; E05Y2900/531; F; F16; F16B; F16B2200/00; F16B2200/20; F16B2200/205
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 |