Patent US2967684A successfully refreshed from Google Patents.
US2967684A
Expired / Lapsed
US
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Combination inflight refueling and dumping for helicopters
Assignee: Individual
•
Filing: 1958-12-31
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Granted: 1961-01-10
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Expires: 1978-12-31
Abstract
No abstract record available.
Inventors
- 👤 Robert S Knecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:01
CPC Classifications
B; B64; B64D; B64D39/00; B64D39/04; B64C; B64C27/00; B64C27/04; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/8807
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR795517A
Cited
US2440758A
Cited
US2692102A
Cited
GB695200A
Cited
GB767138A
Cited
US2879016A
Cited
US2880749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-10 | 1964-07-11 | 1965-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-10 | 1968-07-11 | 1969-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-10 | 1972-07-11 | 1973-01-10 | $7700.00 | Window Closed / Lapsed |