Patent US3445792A successfully refreshed from Google Patents.
US3445792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical frequency filter with additional coupling to increase slope of damping rise
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1963-06-28
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Granted: 1969-05-20
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Expires: 1983-06-28
Abstract
No abstract record available.
Inventors
- 👤 Manfred Borner
- 👤 Jurgen Spitzner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:03
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/52; H03H9/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A MECHANICAL FREQUENCY FILTER, COMPRISING, IN COMBINATION: AT LEAST THREE SIMILARLY CONSTRUCTED RESONATORS; MECHANICAL COUPLING LINES CONNECTING ADJACENT RESONATORS; AND COUPLING MEANS MECHANICALLY COUPLING TWO RESONATORS WHICH ARE NOT ADJACENT TO EACH OTHER FOR PROVIDING DIPS IN THE FILTER CHARACTERISTIC; THE COUPLING LINES WHICH CONNECT ADJACENT RESONATORS HAVING APPROXIMATELY EQUAL LENGTHS AND SAID COUPLING MEANS COUPLING RESONATORS WHICH ARE SPACED FROM ONE ANOTHER BY A DISTANCE WHICH IS APPROXIMATELY AN ODD MULTIPLE OF THE COUPLING THE LENGTH BETWEEN ADJACENT RESONATORS.
Claim 2
Dependent Claim
80 words
A MECHANICAL FREQUENCY FILTER, COMPRISING, IN COMBINATION: AT LEAST THREE SIMILARLY CONSTRUCTED RESONATORS; MECHANICAL COUPLING LINES CONNECTING ADJACENT RESONATORS; AND COUPLING MEANS MECHANICALLY COUPLING TWO RESONATORS WHICH ARE NOT ADJACENT TO EACH OTHER FOR PROVIDING DIPS IN THE FILTER CHARACTERISTIC; THE COUPLING LINES WHICH CONNECT ADJACENT RESONATORS HAVING APPROXIMATELY EQUAL LENGTHS AND SAID COUPLING MEANS COUPLING RESONATORS WHICH ARE SPACED FROM ONE ANOTHER BY A DISTANCE WHICH IS APPROXIMATELY AN ODD MULTIPLE OF THE COUPLING THE LENGTH BETWEEN ADJACENT RESONATORS.
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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |