Patent US3271693A successfully refreshed from Google Patents.
US3271693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Band rejection filter
Assignee: Individual
•
Filing: 1962-10-01
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Granted: 1966-09-06
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Expires: 1982-10-01
Abstract
No abstract record available.
Inventors
- 👤 Jr William E Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:39
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/1213
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A BAND REJECTION FILTER COMPRISING A SOURCE OF A RELATIVELY BROAD BAND OF SIGNAL FREQUENCIES, AN OUTPUT COUPLING TRANSFORMER, THE PRIMARY WINDING OF SAID TRANSFORMER BEING CENTER TAPPED, AN UNTUNED AMPLIFIER COUPLED BETWEEN SAID SOURCE AND ONE TERMINAL OF SAID PRIMARY WINDING, A TUNED AMPLIFIER COUPLED BETWEEN SAID SOURCE AND THE OTHER TERMINAL OF SAID PRIMARY WINDING, SAID TUNED AMPLIFIER COMPRISING A RESONANT CIRCUIT COUPLED ACROSS THE INPUT OF THE AMPLIFIER, A FEEDBACK CIRCUIT COUPLED BETWEEN THE OUTPUT OF SAID TUNED AMPLIFIER AND AN INTERMEDIATE POINT ON SAID RESONANT CIRCUIT FOR REGENERATIVELY RECIRCULATING SELECTED FREQUENCIES OF SAID SPECTRUM FOR INCREASING THE SELECTIVELY, Q, OF SAID AMPLIFIER.
Claim 2
Dependent Claim
106 words
A BAND REJECTION FILTER COMPRISING A SOURCE OF A RELATIVELY BROAD BAND OF SIGNAL FREQUENCIES, AN OUTPUT COUPLING TRANSFORMER, THE PRIMARY WINDING OF SAID TRANSFORMER BEING CENTER TAPPED, AN UNTUNED AMPLIFIER COUPLED BETWEEN SAID SOURCE AND ONE TERMINAL OF SAID PRIMARY WINDING, A TUNED AMPLIFIER COUPLED BETWEEN SAID SOURCE AND THE OTHER TERMINAL OF SAID PRIMARY WINDING, SAID TUNED AMPLIFIER COMPRISING A RESONANT CIRCUIT COUPLED ACROSS THE INPUT OF THE AMPLIFIER, A FEEDBACK CIRCUIT COUPLED BETWEEN THE OUTPUT OF SAID TUNED AMPLIFIER AND AN INTERMEDIATE POINT ON SAID RESONANT CIRCUIT FOR REGENERATIVELY RECIRCULATING SELECTED FREQUENCIES OF SAID SPECTRUM FOR INCREASING THE SELECTIVELY, Q, OF SAID AMPLIFIER.
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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |