US3379991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic gain control employing photoresistors
Assignee: Individual
•
Filing: 1967-05-15
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Granted: 1968-04-23
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Expires: 1987-05-15
Abstract
No abstract record available.
Inventors
- 👤 Milton C Clerc
- 👤 Paul E Carroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:13
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
240 words
AUTOMATIC GAIN CONTROL APPARATUS FOR A SEISMIC AMPLIFIER SYSTEM COMPRISING: (A) A PLURALITY OF CASCADED SEISMIC AMPLIFIER STAGES EACH HAVING AN INPUT AND AN OUTPUT, (B) A SOURCE OF LOW FREQUENCY SIGNALS CONNECTED TO THE INPUT OF THE FIRST OF THE AMPLIFIER STAGES, (C) GAIN CONTROL VOLTAGE GENERATING MEANS HAVING AN INPUT CONNECTED TO THE OUTPUT OF THE LAST OF THE AMPLIFIER STAGES FOR PROVIDING A VOLTAGE WHICH INCREASES AS A FUNCTION OF THE MAGNITUDE OF THE LOW FREQUENCY SIGNALS APPEARING ON SUCH OUTPUT AFTER SUCH MAGNITUDE EXCEEDS A PRESELECTED THRESHOLD LEVEL, (D) AMPLIFYING MEANS HAVING AN INPUT CONNECTED TO THE OUTPUT OF THE GAIN CONTROL VOLTAGE GENERATING MEANS, (E) RADIATION SOURCE MEANS CONNECTED TO THE OUTPUT OF THE AMPLIFYING MEANS TO BE ENERGIZED ACCORDING TO THE MAGNITUDE OF THE GAIN CONTROL VOLTAGE, (F) A PLURALITY OF RADIATION SENSITIVE RESISTIVE ELEMENTS POSITIONED TO BE ILLUMINATED BY THE RADIATION SOURCE MEANS A DIFFERENT ONE OF SAID ELEMENTS BEING CONNECTED IN THE INPUT OF EACH AMPLIFIER STAGE TO ATTENUATE THE SIGNALS APPLIED TO SUCH INPUT IN RESPONSE TO THE RADIATION FROM SAID RADIATION SOURCE MEANS WHICH IMPINGES ON SUCH ELEMENT, AND (G) A RADIATION SENSITIVE RESISTOR POSITIONED TO BE ILLUMINATED BY THE RADIATION SOURCE MEANS AND CONNECTED IN THE INPUT OF THE AMPLIFYING MEANS TO ATTENUATE THE GAIN CONTROL VOLTAGE APPLIED THERETO IN AN INVERSE RELATION TO THE MAGNITUDE OF THE RADIATION FROM SAID RADIATION SOURCE MEANS WHICH IMPINGES UPON THE RESISTOR.
Claim 2
Dependent Claim
240 words
AUTOMATIC GAIN CONTROL APPARATUS FOR A SEISMIC AMPLIFIER SYSTEM COMPRISING: (A) A PLURALITY OF CASCADED SEISMIC AMPLIFIER STAGES EACH HAVING AN INPUT AND AN OUTPUT, (B) A SOURCE OF LOW FREQUENCY SIGNALS CONNECTED TO THE INPUT OF THE FIRST OF THE AMPLIFIER STAGES, (C) GAIN CONTROL VOLTAGE GENERATING MEANS HAVING AN INPUT CONNECTED TO THE OUTPUT OF THE LAST OF THE AMPLIFIER STAGES FOR PROVIDING A VOLTAGE WHICH INCREASES AS A FUNCTION OF THE MAGNITUDE OF THE LOW FREQUENCY SIGNALS APPEARING ON SUCH OUTPUT AFTER SUCH MAGNITUDE EXCEEDS A PRESELECTED THRESHOLD LEVEL, (D) AMPLIFYING MEANS HAVING AN INPUT CONNECTED TO THE OUTPUT OF THE GAIN CONTROL VOLTAGE GENERATING MEANS, (E) RADIATION SOURCE MEANS CONNECTED TO THE OUTPUT OF THE AMPLIFYING MEANS TO BE ENERGIZED ACCORDING TO THE MAGNITUDE OF THE GAIN CONTROL VOLTAGE, (F) A PLURALITY OF RADIATION SENSITIVE RESISTIVE ELEMENTS POSITIONED TO BE ILLUMINATED BY THE RADIATION SOURCE MEANS A DIFFERENT ONE OF SAID ELEMENTS BEING CONNECTED IN THE INPUT OF EACH AMPLIFIER STAGE TO ATTENUATE THE SIGNALS APPLIED TO SUCH INPUT IN RESPONSE TO THE RADIATION FROM SAID RADIATION SOURCE MEANS WHICH IMPINGES ON SUCH ELEMENT, AND (G) A RADIATION SENSITIVE RESISTOR POSITIONED TO BE ILLUMINATED BY THE RADIATION SOURCE MEANS AND CONNECTED IN THE INPUT OF THE AMPLIFYING MEANS TO ATTENUATE THE GAIN CONTROL VOLTAGE APPLIED THERETO IN AN INVERSE RELATION TO THE MAGNITUDE OF THE RADIATION FROM SAID RADIATION SOURCE MEANS WHICH IMPINGES UPON THE RESISTOR.
References Cited (Backward Citations)
US3225304A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |