US878022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed-controlling reversing-propeller.
Assignee: C F Roper & Co
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Filing: 1906-10-29
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Granted: 1908-02-04
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Expires: 1926-10-29
Abstract
No abstract record available.
Inventors
- 👤 Charles F Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:41
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/306
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) | 1911-02-03 | 1911-08-05 | 1912-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1915-02-03 | 1915-08-05 | 1916-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1919-02-03 | 1919-08-05 | 1920-02-04 | $7700.00 | Window Closed / Lapsed |