Patent US3204890A successfully refreshed from Google Patents.
US3204890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter and towed vehicle therefor
Assignee: Individual
•
Filing: 1963-12-05
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Granted: 1965-09-07
•
Expires: 1983-12-05
Abstract
No abstract record available.
Inventors
- 👤 John R Lehn
- 👤 Harold M Troxell
- 👤 Robert C Helm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:34
CPC Classifications
B; B64; B64D; B64D3/00; B64D3/02; B64D1/00; B64D1/22; B64C; B64C27/00; B64C27/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
17 words
AN APPARATUS OF THE CHARACTER DESCRIBED, THE COMBINATION COMPRISING: A ROTARY WING AIRCRAFT; AN ELONGATE HOLLOW CYLINDER;
References Cited (Backward Citations)
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Cited
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Cited
US3119576A
Cited
US3030050A
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FR1300922A
Cited
US3088693A
Cited
US3100093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |