US3095542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active frequency selective filter system
Assignee: Raytheon Co
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Filing: 1960-04-28
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Granted: 1963-06-25
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Expires: 1980-04-28
Abstract
No abstract record available.
Inventors
- 👤 Robert L Fusfield
- 👤 Jr Paul E Sterba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:01
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1638
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
214 words
A FREQUENCY REJECTION SYSTEM RESPONSIVE TO AN INPUT SIGNAL HAVING A PLURALITY OF FREQUENCY COMPONENTS TO PASS ONLY A SELECTED FREQUENCY COMPONENT THEREOF TO A SYSTEM OUTPUT TERMINAL COMPRISING A FREQUENCY SELECTIVE AMPLIFIER RESPONSIVE TO SAID INPUT SIGNAL AND HAVING A CONTROL TERMINAL, FIRST CATHODE FOLLOWER MEANS COUPLED BETWEEN SAID AMPLIFIER AND THE SYSTEM OUTPUT TERMINAL, SWITCHING MEANS HAVING A FIRST AND SECOND INPUT TERMINAL WITH THE FIRST INPUT TERMINAL COUPLED TO THE SYSTEM OUTPUT TERMINAL FOR PROVIDING A FIRST SIGNAL PATH, VOLTAGE DIVIDER MEANS COUPLED TO SAID SYSTEM OUTPUT TERMINAL, SECOND CATHODE FOLLOWER MEANS COUPLED BETWEEN SAID VOLTAGE DIVIDER MEANS AND THE SECOND INPUT TERMINAL OF SAID SWITCHING MEANS TO PROVIDE A SECOND SIGNAL PATH, AND A FIRST AND A SECOND T-NETWORK EACH HAVING AN INPUT TERMINAL COUPLED TO SAID SWITCHING MEANS AND AN OUTPUT TERMINAL COUPLED TO A SUMMING POINT, SAID FIRST AND SECOND T NETWORKS HAVING PHASE CHARACTERISTICS THAT DIFFER BY SUBSTANTIALLY 180 DEGREES INDEPENDENT OF FREQUENCY AND HAVING RELATIVE AMPLITUDE CHARACTERISTICS THAT VARY DIFFERENTLY WITH FREQUENCY BEING EQUAL IN AMPLITUDE AT A DEFINITE FREQUENCY SO AS TO CANCEL AT SAID SUMMING POINT, SAID SWITCHING MEANS BEING CONTROLLABLE TO COUPLE SAID FIRST AND SECOND SIGNAL PATHS RESPECTIVELY THROUGH SAID FIRST AND SECOND T NETWORKS IN A FIRST SWITCH POSITION AND RE-
Claim 2
Dependent Claim
214 words
A FREQUENCY REJECTION SYSTEM RESPONSIVE TO AN INPUT SIGNAL HAVING A PLURALITY OF FREQUENCY COMPONENTS TO PASS ONLY A SELECTED FREQUENCY COMPONENT THEREOF TO A SYSTEM OUTPUT TERMINAL COMPRISING A FREQUENCY SELECTIVE AMPLIFIER RESPONSIVE TO SAID INPUT SIGNAL AND HAVING A CONTROL TERMINAL, FIRST CATHODE FOLLOWER MEANS COUPLED BETWEEN SAID AMPLIFIER AND THE SYSTEM OUTPUT TERMINAL, SWITCHING MEANS HAVING A FIRST AND SECOND INPUT TERMINAL WITH THE FIRST INPUT TERMINAL COUPLED TO THE SYSTEM OUTPUT TERMINAL FOR PROVIDING A FIRST SIGNAL PATH, VOLTAGE DIVIDER MEANS COUPLED TO SAID SYSTEM OUTPUT TERMINAL, SECOND CATHODE FOLLOWER MEANS COUPLED BETWEEN SAID VOLTAGE DIVIDER MEANS AND THE SECOND INPUT TERMINAL OF SAID SWITCHING MEANS TO PROVIDE A SECOND SIGNAL PATH, AND A FIRST AND A SECOND T-NETWORK EACH HAVING AN INPUT TERMINAL COUPLED TO SAID SWITCHING MEANS AND AN OUTPUT TERMINAL COUPLED TO A SUMMING POINT, SAID FIRST AND SECOND T NETWORKS HAVING PHASE CHARACTERISTICS THAT DIFFER BY SUBSTANTIALLY 180 DEGREES INDEPENDENT OF FREQUENCY AND HAVING RELATIVE AMPLITUDE CHARACTERISTICS THAT VARY DIFFERENTLY WITH FREQUENCY BEING EQUAL IN AMPLITUDE AT A DEFINITE FREQUENCY SO AS TO CANCEL AT SAID SUMMING POINT, SAID SWITCHING MEANS BEING CONTROLLABLE TO COUPLE SAID FIRST AND SECOND SIGNAL PATHS RESPECTIVELY THROUGH SAID FIRST AND SECOND T NETWORKS IN A FIRST SWITCH POSITION AND RE-
References Cited (Backward Citations)
US2780724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-06-24 | 1966-12-24 | 1967-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-24 | 1970-12-24 | 1971-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-24 | 1974-12-24 | 1975-06-25 | $7700.00 | Window Closed / Lapsed |