Patent US797621A successfully refreshed from Google Patents.
US797621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary engine.
Assignee: Individual
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Filing: —
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Granted: 1905-08-22
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Expires: 1922-08-22
Abstract
No abstract record available.
Inventors
- 👤 Newton H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:31
CPC Classifications
F; F04; F04C; F04C18/00; F04C18/30; F04C18/34; F04C18/344; F04C18/352
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) | 1908-08-21 | 1909-02-20 | 1909-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-08-21 | 1913-02-20 | 1913-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-08-21 | 1917-02-20 | 1917-08-22 | $7700.00 | Window Closed / Lapsed |