Patent US3270217A successfully refreshed from Google Patents.
US3270217A
Expired / Lapsed
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Switching system
Assignee: Individual
•
Filing: 1963-11-04
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Granted: 1966-08-30
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Expires: 1983-11-04
Abstract
No abstract record available.
Inventors
- 👤 David S Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:40
CPC Classifications
B; B64; B64D; B64D17/00; B64D17/22; B64D17/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
125 words
A SWITCHING SYSTEM FOR OPERATING A PARACHUTE RELEASE MECHANISM, COMPRISING: A CONTROL RECTIFIER HAVING A CATHODE, AND ANODE AND A GATE ELECTRODE; A D.C. POWER SUPPLY; MEANS FOR CONNECTING SAID D.C. POWER SUPPLY ACROSS THE ANODE-CATHODE CIRCUIT OF SAID CONTROLLED RECTIFIER; A CONDENSER; ANEROID SWITCH MEANS FOR CONNECTING SAID CONDENSER TO SAID POWER SUPPLY ABOVE A PREDETERMINED ALTITUDE AND TO SAID GATE ELECTRODE BELOW SAID PREDETERMINED ALTITUED, WHEREBY SAID CONDENSER IS CHARGED WHEN THE DEVICE ASCENDS ABOVE SAID ALTITUDE AND SAID CONDENSER CHARGE IS APPLIED TO SAID GATE ELECTRODE WHEN THE DEVICE DECENDS BELOW SAID ALTITUDE; A CURRENT LIMITING RESISTOR CONNECTED IN THE CATHODE CIRCUIT OF SAID CONTROLLED RECTIFIER; A PARACHUTE RELEASE MECHANISM LOAD CONNECTED IN THE ANODE CIRCUIT OF SAID CONTROLLED RECTIFIER; A NEGATIVE-G
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) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |