US3892968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron capture detector systems
Assignee: Individual
•
Filing: 1973-12-04
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Granted: 1975-07-01
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Expires: 1993-12-04
Abstract
Abstract Two electron capture detectors are connected together such that a gas flows through the first detector and then into the second detector. The potential across the first detector is switched regularly between maximum and minimum values and the signal derived from the second detector is modulated by this switching action whenever a strong electron absorber is present in the gas flow.
Inventors
- 👤 James Ephraim Lovelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:10
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/62; G01N27/64; G01N27/66
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
An electron capture detector system, for detecting the presence of an electron absorber in a gas sample, comprising in combination: first and second electron capture detectors electrically insulated the one from the other, said first and second detectors being coupled together in series such that the gas sample flows through the first detector and then through the second detector, said first detector including electrodes for receiving a potential, said second detector including means for producing an output signal, means periodically switching the potential applied across the electrodes of the first detector between minimum and maximum values for modulating the output signal of the second detector in response to presence of an electron absorber in the gas sample, and means for detecting the output signal from the second detector, said second detector including electrodes, said means for producing an output signal including means applying a polarizing potential to said second detector electrodes, said output signal of said second detector being an alternating signal, said means for detecting the output signal including a synchronous converter for rectifying said alternating signal from said second detector.
Claim 2
Dependent Claim
182 words
An electron capture detector system, for detecting the presence of an electron absorber in a gas sample, comprising in combination: first and second electron capture detectors electrically insulated the one from the other, said first and second detectors being coupled together in series such that the gas sample flows through the first detector and then through the second detector, said first detector including electrodes for receiving a potential, said second detector including means for producing an output signal, means periodically switching the potential applied across the electrodes of the first detector between minimum and maximum values for modulating the output signal of the second detector in response to presence of an electron absorber in the gas sample, and means for detecting the output signal from the second detector, said second detector including electrodes, said means for producing an output signal including means applying a polarizing potential to said second detector electrodes, said output signal of said second detector being an alternating signal, said means for detecting the output signal including a synchronous converter for rectifying said alternating signal from said second detector.
Claim 3
Dependent Claim
194 words
An electron capture detector system, for detecting the presence of an electron absorber in a gas sample, comprising in combination: first and second electron capture detectors electrically insulated the one from the other, said first and second detectors being coupled together in series such that the gas sample flows through the first detector and then through the second detector, said first detector including electrodes for receiving a potential, said second detector including means for producing an output signal, means periodically switching the potential applied across the electrodes of the first detector between minimum and maximum values for modulating the output signal of the second detector in response to presence of an electron absorber in the gas sample, and means for detecting the output signal from the second detector, said periodically switching means comprising a low frequency generator and means coupling same across the electrodes of said first detector, said means for detecting the output signal including a synchrOnous converter coupled to said low frequency generator, said second detector including further electrodes, said synchronous converter being coupled further to one of said second detector electrodes for rectifying the alternating output signal from the second detector.
Claim 4
Dependent Claim
194 words
An electron capture detector system, for detecting the presence of an electron absorber in a gas sample, comprising in combination: first and second electron capture detectors electrically insulated the one from the other, said first and second detectors being coupled together in series such that the gas sample flows through the first detector and then through the second detector, said first detector including electrodes for receiving a potential, said second detector including means for producing an output signal, means periodically switching the potential applied across the electrodes of the first detector between minimum and maximum values for modulating the output signal of the second detector in response to presence of an electron absorber in the gas sample, and means for detecting the output signal from the second detector, said periodically switching means comprising a low frequency generator and means coupling same across the electrodes of said first detector, said means for detecting the output signal including a synchrOnous converter coupled to said low frequency generator, said second detector including further electrodes, said synchronous converter being coupled further to one of said second detector electrodes for rectifying the alternating output signal from the second detector.
Claim 5
Dependent Claim
54 words
The system of claim 2 in which said minimum and maximum values correspond, respectively, to a first potential wherein the free electron concentration in the ionized gas sample is maximized and to a second potential wherein substantially all free electrons present in the ionized gas sample are removed therefrom by said first detector electrodes.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |