US3717810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abnormal impedance test for a string of geophones
Assignee: Gulf Research and Development Co
•
Filing: 1971-07-15
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Granted: 1973-02-20
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Expires: 1991-07-15
Abstract
Abstract A system for dynamically checking a string of geophones as are used in seismic exploration by means of supplying power to the string to thereby operate the geophones in motor mode to thereby check the impedance of the string against a selected acceptable value of impedance.
Inventors
- 👤 F Spanbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:51
CPC Classifications
G; G01; G01V; G01V13/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
A method of dynamically checking a string of geophones comprising the steps of supplying alternating electrical energy to said string, holding one of voltage and current of said electrical energy at some constant RMS value, measuring the other of the RMS value of current and voltage, and comparing said measured value to a predetermined acceptable value thereof for said string.
Claim 2
Independent Claim
60 words
A method of dynamically checking a string of geophones comprising the steps of supplying alternating electrical energy to said string, holding one of voltage and current of said electrical energy at some constant RMS value, measuring the other of the RMS value of current and voltage, and comparing said measured value to a predetermined acceptable value thereof for said string.
Claim 3
Independent Claim
60 words
A method of dynamically checking a string of geophones comprising the steps of supplying alternating electrical energy to said string, holding one of voltage and current of said electrical energy at some constant RMS value, measuring the other of the RMS value of current and voltage, and comparing said measured value to a predetermined acceptable value thereof for said string.
Claim 4
Independent Claim
60 words
A method of dynamically checking a string of geophones comprising the steps of supplying alternating electrical energy to said string, holding one of voltage and current of said electrical energy at some constant RMS value, measuring the other of the RMS value of current and voltage, and comparing said measured value to a predetermined acceptable value thereof for said string.
Claim 5
Dependent Claim
15 words
The method of claim 1, wherein said voltage is held at said constant RMS value.
Claim 6
Dependent Claim
11 words
The method of claim 2, wherein said current is generated sinusoidally.
Claim 7
Dependent Claim
41 words
The method of claim 1, wherein the frequency of said alternating electrical energy is selected so as to be close to but greater than the dynamic peak at the natural resonance frequency of the individual geophones in said string of geophones.
Claim 8
Dependent Claim
73 words
The method of claim 1, wherein a plurality of said strings of geophones are checked sequentially and automatically, comprising the steps of connecting all of said strings to stepping means, and utilizing the result of said comparison step indicating that said measured value of said one string is acceptable to cause said stepping means to disconnect said one string from said measuring means and to connect tHe next string to said measuring means.
Claim 9
Dependent Claim
44 words
The method of claim 5, and operating first indicating means to indicate that a particular string has an acceptable measured value or operating second indicating means to indicate a particular string has an unacceptable measured value after said step of comparing for each string.
Claim 10
Dependent Claim
64 words
Apparatus for dynamically checking a string of geophones comprising power supply means, said power supply means including means to hold one of voltage and current of the electrical energy supplied at some constant RMS value, means for measuring the other of the RMS value of current and voltage, and means for comparing said measured value to a predetermined acceptable value thereof for said string.
Claim 11
Dependent Claim
64 words
Apparatus for dynamically checking a string of geophones comprising power supply means, said power supply means including means to hold one of voltage and current of the electrical energy supplied at some constant RMS value, means for measuring the other of the RMS value of current and voltage, and means for comparing said measured value to a predetermined acceptable value thereof for said string.
Claim 12
Dependent Claim
21 words
The combination of claim 7, wherein said power supply means comprises means to hold said voltage at said constant RMS value.
Claim 13
Dependent Claim
19 words
The combination of claim 8, wherein said power supply means comprises means to cycle the value of current sinusoidally.
Claim 14
Dependent Claim
45 words
The combination of claim 7, and stepping means, means for connecting a plurality of said strings of geophones to said stepping means, and said comparing means including means to cause said stepping means to sequentially connect each of said strings to said power supply means.
Claim 15
Dependent Claim
34 words
The combination of claim 10, first indicating means for indicating that a particular string has an acceptable measured value, and second indicating means for indicating that a particular string has an unacceptable measured value.
Claim 16
Dependent Claim
42 words
The combination of claim 7, wherein said power supply means causes the frequency of said alternating electrical energy to be close to but greater than the dynamic peak at the natural resonance frequency of the individual geophones in said string of geophones.
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |