Patent US2783139A successfully refreshed from Google Patents.
US630693A
Expired / Lapsed
US
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Rotary engine.
Assignee: THOMAS SLATER WALKER
•
Filing: 1898-07-22
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Granted: 1899-08-08
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Expires: 1918-07-22
Abstract
No abstract record available.
Inventors
- 👤 James Thomas Hays
- 👤 Gilbert Lefevre Depuy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:26
CPC Classifications
F; F01; F01C; F01C1/00; F01C1/30; F01C1/34; F01C1/344
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) | 1902-08-08 | 1903-02-07 | 1903-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1906-08-08 | 1907-02-07 | 1907-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1910-08-08 | 1911-02-07 | 1911-08-09 | $7700.00 | Window Closed / Lapsed |