US3136975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring circuit for logging instruments
Assignee: Shell USA Inc
•
Filing: 1959-07-20
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Granted: 1964-06-09
•
Expires: 1979-07-20
Abstract
No abstract record available.
Inventors
- 👤 Robert H Kolb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:52
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A SYSTEM FOR MONITORING THE INSTALLATION IN A WELLBORE OF A VIBRATING STRING DEVICE CAPABLE OF MEASURING A PHYSICAL CHARACTERISTIC, SAID SYSTEM COMPRISING: A CABLE COUPLING THE DEVICE TO THE SURFACE OF THE WELL, A PULSING CIRCUIT LOCATED AT THE SURFACE AND HAVING A FIRST CAPACITANCE RESISTANCE CIRCUIT HAVING AN ADJUSTABLE TIME CONSTANT, SAID CAPACITANCE RESISTANCE CIRCUIT BEING COUPLED TO A SECOND CAPACITANCE RESISTANCE CIRCUIT THROUGH A FIRST STATIC DEVICE HAVING A PREDETERMINED BREAKDOWN VOLTAGE; SAID SECOND CAPACITANCE RESISTANCE CIRCUIT HAVING A RELATIVELY SHORT TIME CONSTANT AND COUPLED TO GROUND THROUGH A SECOND STATIC DEVICE HAVING A PREDETERMINED BREAKDOWN VOLTAGE; SAID SECOND CAPACITANCE RESISTANCE CIRCUIT BEING COUPLED TO SAID CABLE THROUGH A DIODE TO TRANSMIT THE PULSE PRODUCED BY SAID SECOND CAPACITANCE RESISTANCE CIRCUIT; TO ENERGIZE THE DEVICE SAID CABLE IN ADDITION BEING COUPLED TO AN AMPLIFIER AND AUDIO REPRODUCING MEANS LOCATED AT THE SURFACE TO REPRODUCE BOTH SAID PULSE AND THE RESPONSE OF THE DEVICE.
Claim 2
Independent Claim
156 words
A SYSTEM FOR MONITORING THE INSTALLATION IN A WELLBORE OF A VIBRATING STRING DEVICE CAPABLE OF MEASURING A PHYSICAL CHARACTERISTIC, SAID SYSTEM COMPRISING: A CABLE COUPLING THE DEVICE TO THE SURFACE OF THE WELL, A PULSING CIRCUIT LOCATED AT THE SURFACE AND HAVING A FIRST CAPACITANCE RESISTANCE CIRCUIT HAVING AN ADJUSTABLE TIME CONSTANT, SAID CAPACITANCE RESISTANCE CIRCUIT BEING COUPLED TO A SECOND CAPACITANCE RESISTANCE CIRCUIT THROUGH A FIRST STATIC DEVICE HAVING A PREDETERMINED BREAKDOWN VOLTAGE; SAID SECOND CAPACITANCE RESISTANCE CIRCUIT HAVING A RELATIVELY SHORT TIME CONSTANT AND COUPLED TO GROUND THROUGH A SECOND STATIC DEVICE HAVING A PREDETERMINED BREAKDOWN VOLTAGE; SAID SECOND CAPACITANCE RESISTANCE CIRCUIT BEING COUPLED TO SAID CABLE THROUGH A DIODE TO TRANSMIT THE PULSE PRODUCED BY SAID SECOND CAPACITANCE RESISTANCE CIRCUIT; TO ENERGIZE THE DEVICE SAID CABLE IN ADDITION BEING COUPLED TO AN AMPLIFIER AND AUDIO REPRODUCING MEANS LOCATED AT THE SURFACE TO REPRODUCE BOTH SAID PULSE AND THE RESPONSE OF THE DEVICE.
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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |