US3131361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency-sensitive connecting network
Assignee: AT&T Inc
•
Filing: 1960-06-13
•
Granted: 1964-04-28
•
Expires: 1980-06-13
Abstract
No abstract record available.
Inventors
- 👤 Sherman T Brewer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:06
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/10; H04B3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
AN ELECTRIC SIGNAL REPEATER COMPRISING AN AMPLIFIER HAVING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT, SAID AMPLIFIER BEING ADAPTED TO PASS A BAND OF FREQUENCIES INCLUDING A SIGNAL FREQUENCY BAND AND A SIGNATURE FREQUENCY BAND, A FEEDBACK PATH CONNECTING SAID OUTPUT CIRCUIT TO SAID INPUT CIRCUIT, A FREQUENCY-SENSITIVE NETWORK CONNECTED IN SAID FEEDBACK PATH AND COMPRISING A PIEZOELETRIC CRYSTAL CONNECTED IN A SHUNT BRANCH THEREOF, SAID CRYSTAL HAVING A PRIMARY RESONANT CONDITION AT A FIRST FREQUENCY IN SAID SIGNATURE FREQUENCY BAND OF SAID REPEATER AND HAVING A SECONDARY RESONANT CONDITION AT A SECOND FREQUENCY IN SAID SIGNAL FREQUENCY BAND, A CAPACITOR CONNECTED IN SERIES IN SAID FEEDBACK PATH, AND A RESISTOR CONNECTED IN PARALLEL WITH SAID CAPACITOR, SAID RESISTOR HAVING A RESISTANCE WHICH IS MUCH SMALLER THAN THE REACTANCE OF SAID CAPACITOR AT SAID SECOND FREQUENCY.
Claim 2
Dependent Claim
122 words
A FREQUENCY-SENSITIVE NETWORK HAVING PREDETERMINED TRANSFER CHARACTERISTICS OVER A CERTAIN BAND OF FREQUENCIES, SAID NETWORK COMPRISING A CAPACITOR CONNECTED IN A SERIES BRANCH OF SAID NETWORK WITH SUBSTANTIALLY NO OTHER IMPEDANCE IN SERIES THEREWITH, RESONANT MEANS CONNECTED IN A SHUNT BRANCH OF SAID NETWORK AND HAVING AT LEAST A FIRST RESONANT CONDITION AT A PREDETERMINED FREQUENCY ABOVE SAID BAND AND A SECOND RESONANT CONDITION AT A FREQUENCY WITHIN SAID BAND, MEANS SUPPRESSING THE EFFECT OF SAID SECOND RESONANT CONDITION UPON THE TRANSMISSION OF SAID NETWORK COMPRISING A RESISTOR, NONREACTIVE MEANS CONNECTING SAID RESISTOR IN PARALLEL WITH SAID CAPACITOR, AND SAID RESISTOR HAVING A RESISTANCE WHICH IS MUCH SMALLER THAN THE REACTANCE OF SAID CAPACITOR AT THE FREQUENCY OF SAID SECOND RESONANT CONDITION.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |