US3246720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seismic reflection amplifier
Assignee: Texaco Inc
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Filing: 1961-10-19
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Granted: 1966-04-19
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Alvin L Parrack
- 👤 John L Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:53
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/30; G01V1/306
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A SEISMIC GEOPHYSICAL EXPLORATION SYSTEM FOR DETERMINING THE COEFFICIENT OF REFLECTION ALONG A SUB-SURFACE LAYER, THE IMPROVEMENT COMPRISING AN ELECTRONIC AMPLIFIER HAVING HIGHLY LINEAR CHARACTERISTICS OVER A RANGE OF SIGNAL FREQUENCIES FROM ABOUT 2 TO ABOUT 500 CYCLES PER SECOND, SAID AMPLIFIER COMPRISING A DIRECT COUPLED BALANCED TRANSISTOR AMPLIFIER OF THE PUSH-PULL TYPE, EACH TRANSISTOR OF SAID TRANSISTOR AMPLIFIER HAVING A BASE, EMITTER AND COLLECTOR ELECTRODE, SAID AMPLIFIER COMPRISING A NONREACTIVE INPUT ATTENUATOR AND HAVING A LOW FREQUENCY TRANSFORMER AT THE INPUT AND THE OUTPUT THEREOF, A DEGENERATIVE FEED BACK CONNECTION ON EACH SIDE OF SAID BALANCED AMPLIFIER, EACH FEED BACK CONNECTION EXTENDING FROM COLLECTOR TO BASE OF RESPECTIVE TRANSISTORS ON EACH SIDE OF THE BALANCED AMPLIFIER, SAID FEED BACK CONNECTION INCLUDING A SHORT CIRCUIT CONNECTION CONNECTED BETWEEN THE FEED BACK CONNECTIONS FOR ELIMINATING FEED BACK OF DIFFERENTIALLY AMPLIFIED SIGNALS.
Claim 2
Dependent Claim
141 words
IN A SEISMIC GEOPHYSICAL EXPLORATION SYSTEM FOR DETERMINING THE COEFFICIENT OF REFLECTION ALONG A SUB-SURFACE LAYER, THE IMPROVEMENT COMPRISING AN ELECTRONIC AMPLIFIER HAVING HIGHLY LINEAR CHARACTERISTICS OVER A RANGE OF SIGNAL FREQUENCIES FROM ABOUT 2 TO ABOUT 500 CYCLES PER SECOND, SAID AMPLIFIER COMPRISING A DIRECT COUPLED BALANCED TRANSISTOR AMPLIFIER OF THE PUSH-PULL TYPE, EACH TRANSISTOR OF SAID TRANSISTOR AMPLIFIER HAVING A BASE, EMITTER AND COLLECTOR ELECTRODE, SAID AMPLIFIER COMPRISING A NONREACTIVE INPUT ATTENUATOR AND HAVING A LOW FREQUENCY TRANSFORMER AT THE INPUT AND THE OUTPUT THEREOF, A DEGENERATIVE FEED BACK CONNECTION ON EACH SIDE OF SAID BALANCED AMPLIFIER, EACH FEED BACK CONNECTION EXTENDING FROM COLLECTOR TO BASE OF RESPECTIVE TRANSISTORS ON EACH SIDE OF THE BALANCED AMPLIFIER, SAID FEED BACK CONNECTION INCLUDING A SHORT CIRCUIT CONNECTION CONNECTED BETWEEN THE FEED BACK CONNECTIONS FOR ELIMINATING FEED BACK OF DIFFERENTIALLY AMPLIFIED SIGNALS.
References Cited (Backward Citations)
US1784439A
Cited
US2118441A
Cited
US2281949A
Cited
US2292136A
Cited
US2351456A
Cited
US2792067A
Cited
US2835748A
Cited
US3018444A
Cited
US3102984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |