US3379271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicles for travelling over a surface provided with flexible skirts of differing stiffnesses
Assignee: Hovercraft Development Ltd
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Filing: 1965-09-07
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Granted: 1968-04-23
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Expires: 1985-09-07
Abstract
No abstract record available.
Inventors
- 👤 Hopkins Leslie Arthur
- 👤 Moore Robert Granville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:32
CPC Classifications
B; B60; B60V; B60V1/00; B60V1/04; B60V1/043; B60V1/16
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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |