Patent US1942543A successfully refreshed from Google Patents.
US1942543A
Expired / Lapsed
US
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Pneumatic engine
Assignee: National Pneumatic Co Inc
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Filing: 1932-10-29
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Granted: 1934-01-09
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Expires: 1952-10-29
Abstract
No abstract record available.
Inventors
- 👤 Paris R Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:20
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/22; F15B15/225; F01; F01B; F01B29/00; F01B29/02
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) | 1937-01-08 | 1937-07-10 | 1938-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-08 | 1941-07-10 | 1942-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-08 | 1945-07-10 | 1946-01-09 | $7700.00 | Window Closed / Lapsed |