US3457891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propulsive systems for vessels
Assignee: Hydroconic Ltd
•
Filing: 1968-08-30
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Granted: 1969-07-29
•
Expires: 1988-08-30
Abstract
No abstract record available.
Inventors
- 👤 Ronald Clark
- 👤 Ewan Christian Brew Corlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:52
CPC Classifications
B; B63; B63H; B63H5/00; B63H5/07; B63H5/14; B63H25/00; B63H25/06; B63H25/38; B63H2025/063; B63H2025/066
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3412703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |