Patent US3179906A successfully refreshed from Google Patents.
US3179906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
By-pass netwoems when
Assignee: —
•
Filing: —
•
Granted: 1965-04-20
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Expires: 1982-04-20
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:37
CPC Classifications
—
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A BAND ELIMINATION FILTER COMPRISING A BAND ELIMINATION NETWORK INCLUDING A PIEZO-ELECTRIC CRYSTAL HAVING A FUNDAMENTAL RESONSANCE FREQUENCY WHICH DETERMINES A WANTED ELIMINATION BAND, A SECONDARY RESONANCE FREQUENCY WHICH PRODUCES AN UNWANTED ELIMINATED BAND, TWO PARALLEL TUNED CIRCUITS CONNECTED IN SERIES WITH THE INPUT AND WITH THE OUTPUT, RESPECTIVELY, OF SAID BAND ELIMINATION NETWORK AND PROVIDING A HIGH IMPEDANCE AT SAID SECONDARY RESONANCE FREQUENCY, AND A BY-PASS NETWORK CONNECTED IN PARALLEL WITH THE OVERALL CIRCUIT ARRANGEMENT OF THE BAND ELIMINATION NETWORK AND TNED CIRCUITS, SAID BY-PASS NETWORK HAVING A HIGH IMPEDANCE AT SAID FUNDAMENTAL RESONANCE FREQUENCY AND A LOW IMPEDANCE AT SAID
Claim 2
Dependent Claim
102 words
A BAND ELIMINATION FILTER COMPRISING A BAND ELIMINATION NETWORK INCLUDING A PIEZO-ELECTRIC CRYSTAL HAVING A FUNDAMENTAL RESONSANCE FREQUENCY WHICH DETERMINES A WANTED ELIMINATION BAND, A SECONDARY RESONANCE FREQUENCY WHICH PRODUCES AN UNWANTED ELIMINATED BAND, TWO PARALLEL TUNED CIRCUITS CONNECTED IN SERIES WITH THE INPUT AND WITH THE OUTPUT, RESPECTIVELY, OF SAID BAND ELIMINATION NETWORK AND PROVIDING A HIGH IMPEDANCE AT SAID SECONDARY RESONANCE FREQUENCY, AND A BY-PASS NETWORK CONNECTED IN PARALLEL WITH THE OVERALL CIRCUIT ARRANGEMENT OF THE BAND ELIMINATION NETWORK AND TNED CIRCUITS, SAID BY-PASS NETWORK HAVING A HIGH IMPEDANCE AT SAID FUNDAMENTAL RESONANCE FREQUENCY AND A LOW IMPEDANCE AT SAID
References Cited (Backward Citations)
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Cited
US2088203A
Cited
US2065565A
Cited
US2076248A
Cited
US2248776A
Cited
US2640879A
Cited
US2913682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |