US3122016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoelectric apparatus and method
Assignee: Atlantic Richfield Co
•
Filing: 1960-03-02
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Granted: 1964-02-25
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Expires: 1980-03-02
Abstract
No abstract record available.
Inventors
- 👤 Glenn W Fordham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/02; G01K7/021
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
A METHOD OF ACCURATELY MEASURING A MINUTE NATURAL TEMPERATURE DIFFERENTIAL BETWEEN TWO POINTS IN A BOREHOLE DRILLED IN A SUBSURFACE FORMATION WITH A THERMOCOUPLE CIRCUIT INCLUDING COPPER WIRES AND CONSTANTAN WIRE AND A RUGGED, PORTABLE MEASURING CIRCUIT COMPRISING THE STEPS OF (A) MINIMIZING THE GENERATION OF SPURIOUS E.M.F. IN THE THERMOCOUPLE CIRCUIT BY POSITIONING THE CONSTANTAN WIRE IN SAID THERMOCOUPLE CIRCUIT BETWEEN THE TWO POINTS IN SAID BOREHOLE, (B) FIXING TWO ENDS OF SAID THERMOCOUPLE CIRCUIT TO THE SURFACE ABOVE THE BOREHOLE, (C) RE-ESTABLISHING THE TEMPERATURE GRADIENT NATURALLY EXISTING BETWEEN SAID TWO POINTS IN SAID BOREHOLE BEFORE SAID BOREHOLE WAS DRILLED, (D) CONNECTING THE PORTABLE MEASURING CIRCUIT TO SAID TWO ENDS OF SAID THERMOCOUPLE CIRCUIT, (E) ADJUSTING A DUMMY LOAD RESISTANCE TO EQUAL THE TOTAL RESISTANCE OF SAID THERMOCOUPLE CIRCUIT, (F) BUCKING OUT SPURIOUS E.M.F.''S IN THE MEASURING CIRCUIT WHEN SAID DUMMY LOAD RESISTANCE IS CONNECTED TO SAID MEASURING CIRCUIT, (G) REPLACING SAID DUMMY LOAD WITH SAID THERMOCOUPLE CIRCUIT, AND (H) OBTAINING AN ACCURATE MEASUREMENT OF THE SMALL TEMPERATURE DIFFERENTIAL BETWEEN SAID TWO POINTS BY INTRODUCING A KNOWN BUCKING VOLTAGE EQUAL TO THE WHOLE NUMBER VALUE OF THE VOLTAGE DEVELOPED BY SAID TEMPERATURE DIFFERENTIAL AND MEASURING THE FRACTIONAL VALUE VOLTAGE WITH SAID MEASURING CIRCUIT.
Claim 2
Independent Claim
204 words
A METHOD OF ACCURATELY MEASURING A MINUTE NATURAL TEMPERATURE DIFFERENTIAL BETWEEN TWO POINTS IN A BOREHOLE DRILLED IN A SUBSURFACE FORMATION WITH A THERMOCOUPLE CIRCUIT INCLUDING COPPER WIRES AND CONSTANTAN WIRE AND A RUGGED, PORTABLE MEASURING CIRCUIT COMPRISING THE STEPS OF (A) MINIMIZING THE GENERATION OF SPURIOUS E.M.F. IN THE THERMOCOUPLE CIRCUIT BY POSITIONING THE CONSTANTAN WIRE IN SAID THERMOCOUPLE CIRCUIT BETWEEN THE TWO POINTS IN SAID BOREHOLE, (B) FIXING TWO ENDS OF SAID THERMOCOUPLE CIRCUIT TO THE SURFACE ABOVE THE BOREHOLE, (C) RE-ESTABLISHING THE TEMPERATURE GRADIENT NATURALLY EXISTING BETWEEN SAID TWO POINTS IN SAID BOREHOLE BEFORE SAID BOREHOLE WAS DRILLED, (D) CONNECTING THE PORTABLE MEASURING CIRCUIT TO SAID TWO ENDS OF SAID THERMOCOUPLE CIRCUIT, (E) ADJUSTING A DUMMY LOAD RESISTANCE TO EQUAL THE TOTAL RESISTANCE OF SAID THERMOCOUPLE CIRCUIT, (F) BUCKING OUT SPURIOUS E.M.F.''S IN THE MEASURING CIRCUIT WHEN SAID DUMMY LOAD RESISTANCE IS CONNECTED TO SAID MEASURING CIRCUIT, (G) REPLACING SAID DUMMY LOAD WITH SAID THERMOCOUPLE CIRCUIT, AND (H) OBTAINING AN ACCURATE MEASUREMENT OF THE SMALL TEMPERATURE DIFFERENTIAL BETWEEN SAID TWO POINTS BY INTRODUCING A KNOWN BUCKING VOLTAGE EQUAL TO THE WHOLE NUMBER VALUE OF THE VOLTAGE DEVELOPED BY SAID TEMPERATURE DIFFERENTIAL AND MEASURING THE FRACTIONAL VALUE VOLTAGE WITH SAID MEASURING CIRCUIT.
References Cited (Backward Citations)
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Cited
US2311757A
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US2403704A
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US2473627A
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US2673465A
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US2659861A
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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) | 1967-02-24 | 1967-08-26 | 1968-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-24 | 1971-08-26 | 1972-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-24 | 1975-08-26 | 1976-02-25 | $7700.00 | Window Closed / Lapsed |