US1737433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door-operating system
Assignee: National Pneumatic Co Inc
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Filing: 1926-06-16
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Granted: 1929-11-26
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Expires: 1946-06-16
Abstract
No abstract record available.
Inventors
- 👤 Rowntree Harold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:48
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/56; E05F15/565; E05Y; E05Y2900/00; E05Y2900/50; E05Y2900/51
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) | 1932-11-25 | 1933-05-27 | 1933-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-11-25 | 1937-05-27 | 1937-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-11-25 | 1941-05-27 | 1941-11-26 | $7700.00 | Window Closed / Lapsed |