Patent US3896401A successfully refreshed from Google Patents.
US3896401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromechanical filter comprising electromechanical resonators at least one of which has different input and output equivalent inductances
Assignee: NEC Corp
•
Filing: 1973-02-26
•
Granted: 1975-07-22
•
Expires: 1993-02-26
Abstract
Abstract In a mechanical filter comprising a plurality of electromechanical resonators electrically connected in parallel, at least one of the electromechanical resonators is possessed of different equivalent inductances when measured from the input side and from the output side.
Inventors
- 👤 Takeshi Yano
- 👤 Takehiro Futami
- 👤 Mototsugu Ookura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
An electromechanical filter having a plurality of electromechanical resonators electrically connected in parallel, wherein the improvement comprises at least one electromechanical resonator whose equivalent inductance measured from the input side and whose equivalent inductance measured from the output side are different, said at least one electromechanial resonator comprising a piece capable of being set into mechanical vibration in a predetermined mode, first and second piezoelectric ceramic pieces, and means for supplying electric power across each of said ceramic pieces, said ceramic pieces being attached tO said piece over predetermined effective areas, respectively, so as to set said piece into said vibration when electric power is supplied thereto, said effective areas being different.
Claim 2
Dependent Claim
112 words
An electromechanical filter having a plurality of electromechanical resonators electrically connected in parallel, wherein the improvement comprises at least one electromechanical resonator whose equivalent inductance measured from the input side and whose equivalent inductance measured from the output side are different, said at least one electromechanial resonator comprising a piece capable of being set into mechanical vibration in a predetermined mode, first and second piezoelectric ceramic pieces, and means for supplying electric power across each of said ceramic pieces, said ceramic pieces being attached tO said piece over predetermined effective areas, respectively, so as to set said piece into said vibration when electric power is supplied thereto, said effective areas being different.
Claim 3
Dependent Claim
24 words
An electromechanical filter as claimed in claim 1, wherein said first and said second ceramic pieces have different areas of contact with said piece.
Claim 4
Dependent Claim
34 words
An electromechanical filter as claimed in claim 1, wherein one of said first and said second ceramic pieces is attached to said piece in offset position relative to the other of said ceramic pieces.
Claim 5
Dependent Claim
46 words
An electromechanical filter as claimed in claim 1, wherein said electric power supplying means comprises a pair of electrodes covering the opposing surfaces of the individual ceramic pieces and the area of one of said electrodes is made different from the areas of the other electrodes.
Claim 6
Dependent Claim
37 words
An electromechanical filter as claimed in claim 1, wherein the number of said electromechanical resonators is three, two of said electromechanical resonators having different equivalent inductances when measured from the input side and from the output side.
Claim 7
Dependent Claim
37 words
An electromechanical filter as claimed in claim 1, wherein the number of said electromechanical resonators is two, one of said electromechanical resonators having different equivalent inductances when measured from the input side and from the output side.
References Cited (Backward Citations)
US2980872A
Cited
US3054968A
Cited
US3241092A
Cited
US3283264A
Cited
US3374448A
Cited
US3426300A
Cited
US3389351A
Cited
US3588551A
Cited
US3683211A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |