US3332282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter airspeed indicator
Assignee: Canadian Patents and Development Ltd
•
Filing: 1965-01-14
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Granted: 1967-07-25
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Expires: 1985-01-14
Abstract
No abstract record available.
Inventors
- 👤 Donald F Daw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:22
CPC Classifications
G; G01; G01P; G01P5/00; G01P13/00; G01P13/02; G01P13/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A DEVICE FOR MEASURING A COMPONENT OF THE HORIZONTAL AIRSPEED OF A HELICOPTER, COMPRISING: A FIRST CORED COIL MOUNTED ON THE ROTOR OF THE HELICOPTER; AT LEAST ONE STATIONARY SECOND CORED COIL MOUNTED ON THE FRAME OF THE HELICOPTER AND POSITIONED TO COUPLE INDUCTIVELY WITH SAID FIRST COIL PERIODICALLY ON ROTATION OF THE ROTOR; MEANS FOR SUPPLYING TO SAID FIRST COIL A SIGNAL OF A STRENGTH CHARACTERISTIC OF THE PRESSURE REACTIVE TO THE MOVEMENT OF THE ROTOR RELATIVE TO THE AIR AT A POINT SPACED OUTWARDLY FROM ITS AXIS OF ROTATION; AND MEANS TO INDICATE THE SIGNAL INDUCED IN SAID SECOND COIL, SAID INDICATOR MEANS COMPRISING IN SEQUENCE A DEMODULATOR, A FILTER, AND A POTENTIAL MEASURING DEVICE.
Claim 2
Independent Claim
117 words
A DEVICE FOR MEASURING A COMPONENT OF THE HORIZONTAL AIRSPEED OF A HELICOPTER, COMPRISING: A FIRST CORED COIL MOUNTED ON THE ROTOR OF THE HELICOPTER; AT LEAST ONE STATIONARY SECOND CORED COIL MOUNTED ON THE FRAME OF THE HELICOPTER AND POSITIONED TO COUPLE INDUCTIVELY WITH SAID FIRST COIL PERIODICALLY ON ROTATION OF THE ROTOR; MEANS FOR SUPPLYING TO SAID FIRST COIL A SIGNAL OF A STRENGTH CHARACTERISTIC OF THE PRESSURE REACTIVE TO THE MOVEMENT OF THE ROTOR RELATIVE TO THE AIR AT A POINT SPACED OUTWARDLY FROM ITS AXIS OF ROTATION; AND MEANS TO INDICATE THE SIGNAL INDUCED IN SAID SECOND COIL, SAID INDICATOR MEANS COMPRISING IN SEQUENCE A DEMODULATOR, A FILTER, AND A POTENTIAL MEASURING DEVICE.
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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |