US2981221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self propelled amphibious vehicles
Assignee: HERMANN WALTER GEHLEN DIPL ING
•
Filing: 1957-06-03
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Granted: 1961-04-25
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Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Gillois Jean
- 👤 Gehlen Hermann Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:39
CPC Classifications
B; B60; B60F; B60F3/00; B60F3/003; B60F3/0038; B63; B63B; B63B43/00; B63B43/02; B63B43/10; B63B43/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1484109A
Cited
GB188663A
Cited
US2282745A
Cited
US2466236A
Cited
US2514488A
Cited
US2759201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |