US3798536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting leakages by using helium as a tracer gas
Assignee: Individual
•
Filing: 1971-03-26
•
Granted: 1974-03-19
•
Expires: 1991-03-26
Abstract
Abstract A device for detecting leakages through the walls of an enclosure which includes a tube containing a material which blocks the passage of all gases except helium and having a gas receiving end capable of receiving gases from a wall which is to be detected, and an ion pump connected to the other end of the tube having an ammeter connected thereto to provide an indication of the residual pressure of the helium passing through said material.
Inventors
- 👤 P Roubeau
- 👤 P Maillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:57
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202; G01M3/205
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A device for detecting leakages through the walls of an enclosure, using helium as a tracer, comprising means for conveying gases from a wall to be tested including a tube having an input end forming a probe for receiving gases from said wall, an adsorbent element in the form of activated vegetable charcoal filling a portion of said tube so as to be capable of stopping substantially all gases with the exception of helium and any hydrogen that may be present, and means for pumping and detecting the helium by measuring the residual pressure thereof at the output of the adsorbent element, said pumping and detecting means being provided in the form of an ion pump connected to an output end of said tube and means connected to said pump for measuring the ion current of said ion pump, both the portion of the tube containing said adsorbent element and said ion pump being immersed in a cryogenic fluid, said ion pump serving to aspirate any of said hydrogen so that a correct measure of the helium pressure can be obtained.
Claim 2
Independent Claim
181 words
A device for detecting leakages through the walls of an enclosure, using helium as a tracer, comprising means for conveying gases from a wall to be tested including a tube having an input end forming a probe for receiving gases from said wall, an adsorbent element in the form of activated vegetable charcoal filling a portion of said tube so as to be capable of stopping substantially all gases with the exception of helium and any hydrogen that may be present, and means for pumping and detecting the helium by measuring the residual pressure thereof at the output of the adsorbent element, said pumping and detecting means being provided in the form of an ion pump connected to an output end of said tube and means connected to said pump for measuring the ion current of said ion pump, both the portion of the tube containing said adsorbent element and said ion pump being immersed in a cryogenic fluid, said ion pump serving to aspirate any of said hydrogen so that a correct measure of the helium pressure can be obtained.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |