US3309657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual channel well logging system
Assignee: Pgac Dev Co
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Filing: 1965-04-19
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Granted: 1967-03-14
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Expires: 1985-04-19
Abstract
No abstract record available.
Inventors
- 👤 William R Rabson
- 👤 Thomas A Rabson
- 👤 Homer M Willson
- 👤 Torre Leroy C De La
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:15
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12; G; G01; G01V; G01V1/00; G01V1/40; G01V1/44; G01V5/00; G01V5/04; G01V5/045; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
IN A WELL LOGGING SYSTEM, A SUBSURFACE UNIT, A CABLE FOR MOVING SAID UNIT WITHIN A BORE HOLE, FIRST AND SECOND DETECTORS IN SAID UNIT AND EACH ARRANGED TO PRODUCE A PULSE TYPE SIGNAL, MEANS INCLUDED IN SAID SUBSURFACE UNIT FOR CONVERTING PULSES FROM EACH OF SAID DETECTORS INTO A COMPOSITE PULSE CONSISTING ESSENTIALLY OF EQUAL AREA PULSE PORTIONS OF OPPOSITE POLARITY, MEANS FOR TRANSMITTING SAID COMPOSITE PULSES OVER SAID CABLE TO THE EARTH''S SURFACE, AND PULSE INTEGRATOR MEANS LOCATED AT THE EARTH''S SURFACE AND CONNECTED TO SAID CABLE, SAID PULSE INTEGRATOR MEANS HAVING A TIME CONSTANT SUCH THAT EACH OF SAID COMPOSITE PULSES IS CONVERTED INTO A UNIDIRECTIONAL PULSE HAVING SUBSTANTIALLY NO OVERSHOOT PORTION OF THE OPPOSITE POLARITY, SAID UNIDIRECTIONAL PULSES CORRESPONDING TO ONE OF SAID DETECTORS BEING OF THE OPPOSITE POLARITY FROM THOSE UNIDIRECTIONAL PULSES CORRESPONDING TO THE OTHER OF SAID DETECTORS.
Claim 2
Dependent Claim
144 words
IN A WELL LOGGING SYSTEM, A SUBSURFACE UNIT, A CABLE FOR MOVING SAID UNIT WITHIN A BORE HOLE, FIRST AND SECOND DETECTORS IN SAID UNIT AND EACH ARRANGED TO PRODUCE A PULSE TYPE SIGNAL, MEANS INCLUDED IN SAID SUBSURFACE UNIT FOR CONVERTING PULSES FROM EACH OF SAID DETECTORS INTO A COMPOSITE PULSE CONSISTING ESSENTIALLY OF EQUAL AREA PULSE PORTIONS OF OPPOSITE POLARITY, MEANS FOR TRANSMITTING SAID COMPOSITE PULSES OVER SAID CABLE TO THE EARTH''S SURFACE, AND PULSE INTEGRATOR MEANS LOCATED AT THE EARTH''S SURFACE AND CONNECTED TO SAID CABLE, SAID PULSE INTEGRATOR MEANS HAVING A TIME CONSTANT SUCH THAT EACH OF SAID COMPOSITE PULSES IS CONVERTED INTO A UNIDIRECTIONAL PULSE HAVING SUBSTANTIALLY NO OVERSHOOT PORTION OF THE OPPOSITE POLARITY, SAID UNIDIRECTIONAL PULSES CORRESPONDING TO ONE OF SAID DETECTORS BEING OF THE OPPOSITE POLARITY FROM THOSE UNIDIRECTIONAL PULSES CORRESPONDING TO THE OTHER OF SAID DETECTORS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |