Patent US3273834A successfully refreshed from Google Patents.
US3273834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air drop autorotating gyroplane drop chutes
Assignee: Individual
•
Filing: 1961-04-04
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Granted: 1966-09-20
•
Expires: 1981-04-04
Abstract
No abstract record available.
Inventors
- 👤 Bernal L Bower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:21
CPC Classifications
B; B64; B64D; B64D19/00; B64D19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
31 words
THE COMBINATION IN AN AUTOROTATING AIRDROP CHUTE OF A FLEXIBLE BLADE, A BLADE TIP BALANCE WEIGHT, A CONTAINER WITH SAID BLADE FASTENED RIGIDLY THERETO, SAID BLADE HAVING NEGATIVE BLADE SECTION CAMBER.
Claim 2
Dependent Claim
31 words
THE COMBINATION IN AN AUTOROTATING AIRDROP CHUTE OF A FLEXIBLE BLADE, A BLADE TIP BALANCE WEIGHT, A CONTAINER WITH SAID BLADE FASTENED RIGIDLY THERETO, SAID BLADE HAVING NEGATIVE BLADE SECTION CAMBER.
References Cited (Backward Citations)
NL62963C
Cited
US2135700A
Cited
US2614636A
Cited
US2575533A
Cited
FR1032647A
Cited
US2889887A
Cited
US2918235A
Cited
FR1187872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |