US3087120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic volume control circuit
Assignee: Seismograph Service Corp
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Filing: 1959-10-20
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Granted: 1963-04-23
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Expires: 1979-10-20
Abstract
No abstract record available.
Inventors
- 👤 Sidney W Schoellhorn
- 👤 Roberts Frederick Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:45
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0047; H03F; H03F5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN AN AMPLIFIER FOR USE WITH A DETECTOR OF SEISMIC WAVES HAVING A HIGH AMPLITUDE DURING AN INITIAL PERIOD FOLLOWED BY A SUBSEQUENT PERIOD OF SOMEWHAT LOWER AMPLITUDE, SAID AMPLIFIER COMPRISING A PLURALITY OF STAGES OF AMPLIFICATION, A FEEDBACK CIRCUIT HAVING AN INPUT CONNECTED TO ONE OF SAID STAGES AND AN OUTPUT CONNECTED TO ANOTHER OF SAID STAGES FOR SUPPLYING A FEEDBACK SIGNAL TO AFFECT THE GAIN OF SAID ANOTHER STAGE, SAID FEEDBACK CIRCUIT INCLUDING A VARIABLE IMPEDANCE FOR CONTROLLING THE MAGNITUDE OF SAID FEEDBACK SIGNAL, MEANS FOR AUTOMATICALLY VARYING SAID IMPEDANCE IN ACCORDANCE WITH THE AMPLITUDE OF THE OUTPUT SIGNAL FROM SAID ONE STAGE, THEREBY TO CONTROL AUTOMATICALLY THE GAIN OF SAID ANOTHER STAGE, MEANS FOR DEVELOPING A SUPPRESSION SIGNAL HAVING A FIRST LEVEL DURING THE INITIAL PERIOD OF SAID
Claim 2
Dependent Claim
131 words
IN AN AMPLIFIER FOR USE WITH A DETECTOR OF SEISMIC WAVES HAVING A HIGH AMPLITUDE DURING AN INITIAL PERIOD FOLLOWED BY A SUBSEQUENT PERIOD OF SOMEWHAT LOWER AMPLITUDE, SAID AMPLIFIER COMPRISING A PLURALITY OF STAGES OF AMPLIFICATION, A FEEDBACK CIRCUIT HAVING AN INPUT CONNECTED TO ONE OF SAID STAGES AND AN OUTPUT CONNECTED TO ANOTHER OF SAID STAGES FOR SUPPLYING A FEEDBACK SIGNAL TO AFFECT THE GAIN OF SAID ANOTHER STAGE, SAID FEEDBACK CIRCUIT INCLUDING A VARIABLE IMPEDANCE FOR CONTROLLING THE MAGNITUDE OF SAID FEEDBACK SIGNAL, MEANS FOR AUTOMATICALLY VARYING SAID IMPEDANCE IN ACCORDANCE WITH THE AMPLITUDE OF THE OUTPUT SIGNAL FROM SAID ONE STAGE, THEREBY TO CONTROL AUTOMATICALLY THE GAIN OF SAID ANOTHER STAGE, MEANS FOR DEVELOPING A SUPPRESSION SIGNAL HAVING A FIRST LEVEL DURING THE INITIAL PERIOD OF SAID
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-22 | 1966-10-22 | 1967-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-22 | 1970-10-22 | 1971-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-22 | 1974-10-22 | 1975-04-23 | $7700.00 | Window Closed / Lapsed |