US3585845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas leak detectors
Assignee: Individual
•
Filing: 1968-11-04
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Granted: 1971-06-22
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Expires: 1988-11-04
Abstract
Abstract A gas-leak detector, responsive to a halogen-containing tracer gas which is introduced into a vessel to be tested for a leak, comprising a probe through which air in the vicinity of a suspected leak may be drawn and diluted with an inert gas before being passed through an electron capture detector cell, the electric current through the cell serving to detect the presence of the tracer gas.
Inventors
- 👤 Richard C Cornell
- 👤 Robert Gittins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:02
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
Method of detecting leaks in vessels using an electron capture detector cell which comprises introducing a halogencontaining tracer gas into a vessel, drawing in a sample of atmosphere in the vicinity of a suspected leak through a probe, diluting the sample with a gas to which the celL is not responsive such that the atmospheric oxygen content present in the sample gas does not saturate the cell, passing the diluted sample through the detector and measuring the current through the detector.
Claim 2
Dependent Claim
81 words
Method of detecting leaks in vessels using an electron capture detector cell which comprises introducing a halogencontaining tracer gas into a vessel, drawing in a sample of atmosphere in the vicinity of a suspected leak through a probe, diluting the sample with a gas to which the celL is not responsive such that the atmospheric oxygen content present in the sample gas does not saturate the cell, passing the diluted sample through the detector and measuring the current through the detector.
Claim 3
Dependent Claim
67 words
A gas-leak detector comprising an electron capture detector cell, a probe, suction means for drawing a gas sample from the atmosphere through the probe into the cell, a purge gas supply for diluting said gas sample prior to entry into the cell to prevent saturation of the cell with atmospheric oxygen and means for detecting a change in current through the cell produced by the gas sample.
Claim 4
Dependent Claim
67 words
A gas-leak detector comprising an electron capture detector cell, a probe, suction means for drawing a gas sample from the atmosphere through the probe into the cell, a purge gas supply for diluting said gas sample prior to entry into the cell to prevent saturation of the cell with atmospheric oxygen and means for detecting a change in current through the cell produced by the gas sample.
Claim 5
Dependent Claim
14 words
Method as claimed in claim 1 wherein the halogen containing gas is sulfur hexaflouride.
Claim 6
Dependent Claim
34 words
A gas-leak detector as claimed in claim 2, wherein the probe comprises a capillary inlet through which the sample is drawn in, the purge gas being introduced downstream of the capillary through a restriction.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |