US1677305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-cycle supercharging combustion engine
Assignee: Sperry Gyroscope Co Ltd
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Filing: 1924-10-07
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Granted: 1928-07-17
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Expires: 1944-10-07
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Sperry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:09
CPC Classifications
F; F01; F01L; F01L5/00; F01L5/04; F01L5/06; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025
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) | 1931-07-17 | 1932-01-16 | 1932-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-07-17 | 1936-01-16 | 1936-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-07-17 | 1940-01-16 | 1940-07-17 | $7700.00 | Window Closed / Lapsed |