US3811397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propulsion devices
Assignee: UA Engineering Ltd
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Filing: 1971-11-15
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Granted: 1974-05-21
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Expires: 1991-11-15
Abstract
Abstract THE INTAKE DUCT OF A PROPULSION DEVICE FOR A WATER-BORNE VESSEL IS DEFINED BY FIRST AND SECOND MEMBERS, ONE OF WHICH PROVIDES THE MAJOR PORTION OF THE WALL OF THE INTAKE DUCT AND THE OTHER OF WHICH EXTENDS BETWEEN AN INLET OPENING AND AN OUTLET OF THE INTAKE DUCT.
Inventors
- 👤 A Usborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:51
CPC Classifications
B; B63; B63H; B63H11/00; B63H11/02; B63H11/10; B63H11/107; B63H11/113
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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |