Patent US5410471A successfully refreshed from Google Patents.
US3089119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aural landing speed system
Assignee: Individual
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Filing: 1960-11-29
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Granted: 1963-05-07
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Expires: 1980-11-29
Abstract
No abstract record available.
Inventors
- 👤 John P Staples
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:05
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
114 words
A SYSTEM FOR PRODUCING A PLURALITY OF AURAL TONES FOR USE IN LANDING AN AIRCRAFT COMPRISING: A PROBE PROVIDING AN OUTPUT VOLTAGE PROPORTIONAL TO ANGLE OF ATTACK OF AN AIRCRAFT, A FIRST TONE GENERATOR PROVIDING A LOW FREQUENCY TONE, A SECOND TONE GENERATOR PROVIDING A HIGH FREQUENCY TONE, A LOGIC CIRCUIT SELECTIVELY CONNECTING SAID TONE GENERATORS WITH SAID OUTPUT VOLTAGE, AN INTERRUPTER TIMER PROVIDING AN OUTPUT SIGNAL HAVING A FREQUENCY PROPORTIONAL TO INPUT CURRENT, AN INTERRUPTER SWITCH CONNECTED TO SAID INTERRUPTER TIMER AND SAID FIRST AND SECOND TONE GENERATORS, AND VARIABLE GAIN CONTROL MEANS CONNECTED BETWEN SAID LOGIC CIRCUIT AND SAID INTERRUPTER TIMER FOR PROVIDING DIFFERENT LEVELS OF INPUT CURRENT TO SAID INTERRUPTER TIMER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-06 | 1966-11-05 | 1967-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-06 | 1970-11-05 | 1971-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-06 | 1974-11-05 | 1975-05-07 | $7700.00 | Window Closed / Lapsed |