US3469556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contra-rotating propeller drive for surface and submarine vessels
Assignee: Algoship International Ltd
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Filing: 1968-02-06
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Granted: 1969-09-30
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Expires: 1988-02-06
Abstract
No abstract record available.
Inventors
- 👤 George T R Campbell
- 👤 Norman V Laskey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
F; F16; F16H; F16H37/00; F16D; F16D1/00; F16D1/02; F16D1/033; F16D1/06; F16D1/08; F16D1/09; F16D1/093; F16D1/095; F16D1/096; B; B63; B63H; B63H5/00; B63H5/07; B63H5/08; B63H5/10; B63H2005/106; B63H23/00; B63H23/32; B63H23/321; B63H2023/322; B63H23/34; B63H2023/342; B63H2023/346; F16H2700/00; F16H2700/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |