Patent US3344367A successfully refreshed from Google Patents.
US3344367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-frequency tuning-fork electromechanical filter
Assignee: Kokusai Denki Electric Inc
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Filing: 1965-12-17
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Granted: 1967-09-26
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Expires: 1985-12-17
Abstract
No abstract record available.
Inventors
- 👤 Takahashi Kenji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:04
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A LOW-FREQUENCY ELECTROMECHANICAL FILTER COMPRISING, A PLURALITY OF TUNING-FORK RESONATORS, A PLURALITY OF BIFURCATED MECHANICAL COUPLERS SERIALLY, CONTINUOUSLY COUPLING NEXT ADJACENT ONES OF SAID RESONATORS, SAID COUPLERS EACH COMPRISING A BIFURCATED RESONATOR HAVING LEGS EACH CONTINUOUSLY, MECHANICALLY CONNECTED TO A RESPECTIVE LEG OF A PAIR OF THE NEXT ADJACENT TUNING-FORK RESONATORS, SAID COUPLERS BEING DISPOSED FOR TRANSMITTING IN OPERATION MECHANICAL VIBRATIONS SERIALLY THROUGH SAID TUNING-FORK RESSONATORS, MEANS COMPRISING ELECTROMECHANICAL TRANSDUCERS COUPLED TO OPPOSITE END TUNING-FORK RESONATORS OF SAID FILTER FOR RECEIVING AT ONE END OF SAID FILTER AN ELECTRICAL INPUT TO BE FILTERED AND CONVERTING INTO MECHANICAL VIBRATIONS AND CONVERTING SAID MECHANICAL VIBRATIONS FOR TAKING OUT AT AN OPPOSITE END OF SAID FILTER A FILTERED ELECTRICAL OUTPUT.
Claim 2
Dependent Claim
117 words
A LOW-FREQUENCY ELECTROMECHANICAL FILTER COMPRISING, A PLURALITY OF TUNING-FORK RESONATORS, A PLURALITY OF BIFURCATED MECHANICAL COUPLERS SERIALLY, CONTINUOUSLY COUPLING NEXT ADJACENT ONES OF SAID RESONATORS, SAID COUPLERS EACH COMPRISING A BIFURCATED RESONATOR HAVING LEGS EACH CONTINUOUSLY, MECHANICALLY CONNECTED TO A RESPECTIVE LEG OF A PAIR OF THE NEXT ADJACENT TUNING-FORK RESONATORS, SAID COUPLERS BEING DISPOSED FOR TRANSMITTING IN OPERATION MECHANICAL VIBRATIONS SERIALLY THROUGH SAID TUNING-FORK RESSONATORS, MEANS COMPRISING ELECTROMECHANICAL TRANSDUCERS COUPLED TO OPPOSITE END TUNING-FORK RESONATORS OF SAID FILTER FOR RECEIVING AT ONE END OF SAID FILTER AN ELECTRICAL INPUT TO BE FILTERED AND CONVERTING INTO MECHANICAL VIBRATIONS AND CONVERTING SAID MECHANICAL VIBRATIONS FOR TAKING OUT AT AN OPPOSITE END OF SAID FILTER A FILTERED ELECTRICAL OUTPUT.
References Cited (Backward Citations)
US2152955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |