US3389349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement using a narrow band rejection filter
Assignee: Telefunken Patentverwertungs GmbH
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Filing: 1964-03-30
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Granted: 1968-06-18
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Expires: 1984-03-30
Abstract
No abstract record available.
Inventors
- 👤 Troost Albert
- 👤 Maass Hans
- 👤 Vogler Flori
- 👤 Rottgers Heinz-Theo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:41
CPC Classifications
H; H03; H03H; H03H1/00; H03H1/02; H03B; H03B21/00; H03C; H03C1/00; H03C1/08; H03H7/00; H03H7/01; H03H2007/013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A FREQUENCY CONVERSION CIRCUIT FOR CONVERTING A GIVEN FREQUENCY OR FREQUENCY SPECTRUM INTO A DIFFERENT FREQUENCY OR FREQUENCY SPECTRUM, SAID CIRCUIT COMPRISING, IN COMBINATION: A NARROW BAND REJECTION FILTER IN THE FORM OF A FOUR-TERMINAL NETWORK CONSISTING SOLELY OF RESISTIVE AND CAPACITIVE ELEMENTS, HAVING A RESONANT FREQUENCY AT WHICH THE OUTPUT IS A MINIMUM FOR A GIVEN INPUT, AND HAVING INPUT AND OUTPUT TERMINALS, ONE OF SAID ELEMENTS BEING VARIABLE, MEANS FOR APPLYING A SIGNAL TO
Claim 2
Dependent Claim
76 words
A FREQUENCY CONVERSION CIRCUIT FOR CONVERTING A GIVEN FREQUENCY OR FREQUENCY SPECTRUM INTO A DIFFERENT FREQUENCY OR FREQUENCY SPECTRUM, SAID CIRCUIT COMPRISING, IN COMBINATION: A NARROW BAND REJECTION FILTER IN THE FORM OF A FOUR-TERMINAL NETWORK CONSISTING SOLELY OF RESISTIVE AND CAPACITIVE ELEMENTS, HAVING A RESONANT FREQUENCY AT WHICH THE OUTPUT IS A MINIMUM FOR A GIVEN INPUT, AND HAVING INPUT AND OUTPUT TERMINALS, ONE OF SAID ELEMENTS BEING VARIABLE, MEANS FOR APPLYING A SIGNAL TO
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-18 | 1971-12-18 | 1972-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-18 | 1975-12-18 | 1976-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-18 | 1979-12-18 | 1980-06-18 | $7700.00 | Window Closed / Lapsed |