Patent US3294193A successfully refreshed from Google Patents.
US3294193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic impedance measuring instrument
Assignee: —
•
Filing: —
•
Granted: 1966-12-27
•
Expires: 1983-12-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:35
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/12; G; G01; G01H; G01H15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
AN ACOUSTIC BRIDGE COMPRISING AN ACOUSTICALLY SYMMETRICAL TRANSDUCER, TWO MAIN TUBES DISPOSED IN ACOUSTICALLY SYMMETRICAL RELATION TO SAID TRANSDUCER, A VARIABLE ACOUSTIC IMPEDANCE SYSTEM, ONE OF SAID MAIN TUBES BEING ADAPTED TO BE COUPLED TO AN UNKNOWN ACOUSTIC IMPEDANCE BY MEANS OF A COUPLING CAVITY AND THE OTHER TUBE BEING COUPLED TO SAID VARIABLE ACOUSTIC IMPEDANCE SYSTEM, A CHAMBER ADJUSTABLE TO THE VOLUME OF SAID COUPLING CAVITY DISPOSED BETWEEN SAID COUSTIC IMPEDANCE SYSTEM AND SAID OTHER TUBE PROVIDING ACOUSTIC COMMUNICATION THEREBETWEEN, SAID CHAMBER HAVING A CROSS-SECTIONAL AREA SUBSTANTIALLY LARGER THAN THE CROSS-SECTIONAL AREA OF SAID OTHER TUBE, AND AN OUTPUT SYSTEM CONNECTED TO AID MAIN TUBES AND BRIDGING SAID TRANSDUCER IN AN ACOUSTICALLY SYMMETRICAL MANNER FOR COUPLING AN OUTPUT SIGNAL FROM SAID BRIDGE.
Claim 2
Dependent Claim
123 words
AN ACOUSTIC BRIDGE COMPRISING AN ACOUSTICALLY SYMMETRICAL TRANSDUCER, TWO MAIN TUBES DISPOSED IN ACOUSTICALLY SYMMETRICAL RELATION TO SAID TRANSDUCER, A VARIABLE ACOUSTIC IMPEDANCE SYSTEM, ONE OF SAID MAIN TUBES BEING ADAPTED TO BE COUPLED TO AN UNKNOWN ACOUSTIC IMPEDANCE BY MEANS OF A COUPLING CAVITY AND THE OTHER TUBE BEING COUPLED TO SAID VARIABLE ACOUSTIC IMPEDANCE SYSTEM, A CHAMBER ADJUSTABLE TO THE VOLUME OF SAID COUPLING CAVITY DISPOSED BETWEEN SAID COUSTIC IMPEDANCE SYSTEM AND SAID OTHER TUBE PROVIDING ACOUSTIC COMMUNICATION THEREBETWEEN, SAID CHAMBER HAVING A CROSS-SECTIONAL AREA SUBSTANTIALLY LARGER THAN THE CROSS-SECTIONAL AREA OF SAID OTHER TUBE, AND AN OUTPUT SYSTEM CONNECTED TO AID MAIN TUBES AND BRIDGING SAID TRANSDUCER IN AN ACOUSTICALLY SYMMETRICAL MANNER FOR COUPLING AN OUTPUT SIGNAL FROM SAID BRIDGE.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |