Patent US3182744A successfully refreshed from Google Patents.
US3182744A
Expired / Lapsed
US
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Well logging
Assignee: Shell USA Inc
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Filing: 1960-02-10
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Granted: 1965-05-11
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Expires: 1980-02-10
Abstract
No abstract record available.
Inventors
- 👤 Charles B Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:16
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/40; G01V1/44
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
AN ACOUSTICAL WELL LOGGING SYSTEM COMPRISING: A SUBSURFACE APPARATUS HAVING A PAIR OF SPACED RECEIVERS, A SOUND SOURCE POSITIONED ON ONE SIDE OF SAID RECEIVERS FOR PRODUCING ACOUSTICAL IMPULSES WHICH TRAVEL PAST SAID RECEIVERS IN SUCCESSION; EACH OF SAID RECEIVERS HAVING A BACKGROUND NOISE LEVER AND IN ADDITION BEING CAPABLE OF CONVERTING THE RECEIVED IMPULSE INTO A RELATED ELECTRICAL SIGNAL; ONE OF SAID RECEIVERS BEING COUPLED TO A FIRST AMPLIFIER HAVING A FIXED GAIN; A LIMITING CIRCUIT, SAID FIRST AMPLIFIER BEING COUPLED TO SAID LIMITING CIRCUIT TO REDUCE THE SIGNAL TO A UNIFORM MAXIMUM AMPLITUDE; THE OTHER RECEIVER BEING COUPLED TO A SECOND AMPLIFIER HAVING A FIXED GAIN WHICH EXCEEDS THE GAIN OF SAID FIRST AMPLIFIER; A SLICING CIRCUIT, SAID SECOND AMPLIFIER BEING COUPLED TO SAID SLICING CIRCUIT TO RFEMOVE THE NOISE LEVEL OF THE SIGNAL;
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-10 | 1968-11-09 | 1969-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-10 | 1972-11-09 | 1973-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-10 | 1976-11-09 | 1977-05-11 | $7700.00 | Window Closed / Lapsed |