Patent US3235791A successfully refreshed from Google Patents.
US3235791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gain controls using silicon diodes, a d.c. control source and an a.c. bias source
Assignee: Pan American Petroleum Corp
•
Filing: 1961-09-05
•
Granted: 1966-02-15
•
Expires: 1981-09-05
Abstract
No abstract record available.
Inventors
- 👤 James W Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:11
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/24; G01V1/245
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN AN ALTERNATING-CURRENT SIGNAL-CHANNEL ATTENUATOR CIRCUIT COMPRISING A RESISTANCE IN SERIES IN A SIGNAL-CARRYING LEAD AND A SHUNT RESISTANCE CONNECTED BETWEEN SAID LEAD AND GROUND, WHEREIN AT LEAST ONE OF SAID RESISTANCES IS VARIABLE AND NON-LINEAR AND COMPRISES AT LEAST ONE SILICON DIODE MEANS FOR APPLYING A DIRECT-CURRENT POTENTIAL TO SAID DIODE TO VARY ITS EFFECTIVE RESISTANCE FOR SIGNALS, SAID DIRECT-CURRENT POTENTIAL BEING LARGE COMPARED TO THE MAXIMUM SIGNAL VOLTAGE TO BE ATTENUATED, THE IMPROVEMENT WHICH COMPRISES MEANS FOR APPLYING ALSO
Claim 2
Dependent Claim
81 words
IN AN ALTERNATING-CURRENT SIGNAL-CHANNEL ATTENUATOR CIRCUIT COMPRISING A RESISTANCE IN SERIES IN A SIGNAL-CARRYING LEAD AND A SHUNT RESISTANCE CONNECTED BETWEEN SAID LEAD AND GROUND, WHEREIN AT LEAST ONE OF SAID RESISTANCES IS VARIABLE AND NON-LINEAR AND COMPRISES AT LEAST ONE SILICON DIODE MEANS FOR APPLYING A DIRECT-CURRENT POTENTIAL TO SAID DIODE TO VARY ITS EFFECTIVE RESISTANCE FOR SIGNALS, SAID DIRECT-CURRENT POTENTIAL BEING LARGE COMPARED TO THE MAXIMUM SIGNAL VOLTAGE TO BE ATTENUATED, THE IMPROVEMENT WHICH COMPRISES MEANS FOR APPLYING ALSO
References Cited (Backward Citations)
US2775714A
Cited
US2929015A
Cited
US2833980A
Cited
US2956234A
Cited
US3115601A
Cited
US3127577A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-14 | 1969-08-16 | 1970-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-14 | 1973-08-16 | 1974-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-14 | 1977-08-16 | 1978-02-15 | $7700.00 | Window Closed / Lapsed |