US3564488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed measuring device of moving objects
Assignee: Hitachi Ltd
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Filing: 1969-06-16
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Granted: 1971-02-16
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Expires: 1989-06-16
Abstract
Abstract A SPEED MEASURING DEVICE OF MOVING OBJECTS, IN PARTICULAR A DEVICE FOR MEASURING THE SPEED OF A MOVING BODY RUNNING ON RAILS IN WHICH ULTRASONIC WAVES ARE SENT OUT TO AT LEAST ONE OF THE RAILS THROUGH A PIEZOELECTRICAL TRANSDUCER ELEMENT TO DETECT THE DOPPLER FREQUENCY CONTAINED IN THE REFLECTED WAVE FROM THE NEIGHBORHOOD OF THE CONTACT POINT BETWEEN THE WHEEL OF THE MOVING BODY AND THE RAIL FOR SPEED MEASUREMENT.
Inventors
- 👤 Akira Higashi
- 👤 Masao Tsuboi
- 👤 Kakutaro Wada
- 👤 Taro Anzai
- 👤 Torao Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:24
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/02; G01S15/50; G01S15/58
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |