Patent US3553587A successfully refreshed from Google Patents.
US3553587A
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Helicopter crash position indicator
Assignee: Leigh Instruments Ltd
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Filing: 1967-04-17
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Granted: 1971-01-05
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Expires: 1987-04-17
Abstract
Abstract A HELICOPTER CRASH POSITION INDICATOR IN A BISCUIT-SHAPED SHOCK-RESISTANT CAPSULE, RELEASABLE FROM ITS MOUNTING IN RESPONSE TO INERTIAL FORCES UPON IMPACT, HAVING A SELFCONTAINED RADIO TRANSMITTER RENDERED OPERATIVE BY RELEASE OF THE CAPSULE FORM THE HELICOPTER, UPON IMPACT OR BY RUPTURE OF ONE OR MORE FRANGIBLE CRASH SWITCHES UPON IMPACT.
Inventors
- 👤 Haakon Aass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:38
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/02; H04B1/03; H04B1/034; G; G01; G01S; G01S1/00; G01S1/02; G01S1/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |