Patent US781028A successfully refreshed from Google Patents.
US781028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary engine.
Assignee: Individual
•
Filing: 1904-07-15
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Granted: 1905-01-31
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Expires: 1924-07-15
Abstract
No abstract record available.
Inventors
- 👤 Frank V Smith
- 👤 Robert Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:58
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/10; B06B1/16; B06B1/161; B06B1/162; F; F01; F01C; F01C1/00; F01C1/08; F01C1/12; F01C1/14; F01C1/20
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) | 1908-01-31 | 1908-08-01 | 1909-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1912-01-31 | 1912-08-01 | 1913-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1916-01-31 | 1916-08-01 | 1917-01-31 | $7700.00 | Window Closed / Lapsed |