US3572087A
Expired / Lapsed
US
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Phase angle measurement of ultrasonic velocities
Assignee: United States Department of the Army
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Filing: 1969-09-24
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Granted: 1971-03-23
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Expires: 1989-09-24
Abstract
Abstract AN ELECTRONIC DEVICE AND METHOD FOR DETERMINING THE VELOCITY OF PROPAGATION OF COMPRESSIONAL SOUND WAVES IN NON-DISPERSIVE LIQUIDS BY MEASURING RELATIONSHIP BETWEEN PHASE ANGLE AND FREQUENCY. THE DEVICE USES A DOUBLE CRYSTAL, FIXED GEOMETRY, ULTRASONIC INTERFEROMETER TO MEASURE THE COMPRESSIONAL WAVE VELOCITIES IN THE LIQUID.
Inventors
- 👤 Jack G Parks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:48
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/024; G01N2291/00; G01N2291/01; G01N2291/012; G01N2291/02; G01N2291/022; G01N2291/04; G01N2291/042; G01N2291/0421
Claims Analysis
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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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |