US4387774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time recorder for in-hole motors
Assignee: Halliburton Co
•
Filing: 1981-05-04
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Granted: 1983-06-14
•
Expires: 2001-05-04
Abstract
Abstract Real time responsive devices are mounted at the inlet to an in-hole motor to measure the interval of time during which drilling fluid circulates through the motor.
Inventors
- 👤 Roger P. Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/02; E21B44/00; E21B44/005; E21B45/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
55 words
In combination with an in-hole motor, means responsive to the circulation of fluid to said motor, said means comprising: a time recorder adjacent the entrance to the motor, a power source to activate the time recorder and a switch positioned adjacent to said motor and electrically connected between said power source and said time recorder.
Claim 2
Dependent Claim
55 words
In combination with an in-hole motor, means responsive to the circulation of fluid to said motor, said means comprising: a time recorder adjacent the entrance to the motor, a power source to activate the time recorder and a switch positioned adjacent to said motor and electrically connected between said power source and said time recorder.
Claim 3
Dependent Claim
34 words
The in-hole motor of claim 1, in which said power source comprises a battery, and said switch is a pressure differential switch responsive to pressure in the interior and exterior of said pipe section.
Claim 4
Dependent Claim
32 words
The in-hole motor of claim 1 or 2, said switch biased to be open when the pressure difference between the exterior and interior of the pipe section is less than said bias.
Claim 5
Dependent Claim
16 words
An in-hole motor of claim 1 or 2, in which said time recorder is a clock.
Claim 6
Dependent Claim
19 words
An in-hole motor is claim 1 or 2, in which said time recorder includes an oscillator and a counter.
Claim 7
Dependent Claim
31 words
The in-hole motor of claim 1, in which said time recorder includes an oscillator and a counter and means to translate the output of said counter to a real time signal.
Claim 8
Dependent Claim
31 words
The in-hole motor of claim 2, in which said time recorder includes an oscillator and a counter and means to translate the output of said counter to a real time signal.
Claim 9
Dependent Claim
71 words
An in-hole motor comprising a pipe section connected to the inlet to said motor, a receptical in the wall of said pipe section, said receptical containing a battery and a biased pressure differential switch and a signal generator connected to said battery by said switch when the difference between pressure in the interior of said pipe section and the pressure at the exterior of said pipe is greater than said bias.
Claim 10
Dependent Claim
71 words
An in-hole motor comprising a pipe section connected to the inlet to said motor, a receptical in the wall of said pipe section, said receptical containing a battery and a biased pressure differential switch and a signal generator connected to said battery by said switch when the difference between pressure in the interior of said pipe section and the pressure at the exterior of said pipe is greater than said bias.
Claim 11
Dependent Claim
14 words
The motor of claim 8 in which the said signal generator is a clock.
Claim 12
Dependent Claim
16 words
The motor of claim 8, in which the signal generator is a time responsive voltage generator.
Claim 13
Dependent Claim
38 words
The motor of claim 8, in which the signal generator is an oscillator and counter generating a digital signal output responsive to the period of real time during which said switch connects said signal generator to said battery.
Claim 14
Dependent Claim
18 words
In combination with the motor of claim 11, a readout unit translating said digital output to real time.
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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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |