US3828527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leak detection apparatus and inlet interface
Assignee: Varian Medical Systems Inc
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Filing: 1972-09-28
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Granted: 1974-08-13
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Expires: 1992-09-28
Abstract
Abstract A leak detection apparatus having a mass spectrometer tuned to detect helium has an interface with atmosphere in the form of a portable probe containing a gas inlet membrane which is operable without a heater to permit the passage of helium in sufficient quantity for sensitive detection of leaks.
Inventors
- 👤 W Briggs
- 👤 J Maliakal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:00
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/04; H01J49/0422; H01J49/0427; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202; G01M3/205
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A helium gas detection probe comprising a tubular member forming an inlet passage, a perforated suppoRting disk seated in said tubular member over the end of said passage, a solid onepiece polytetrafluoroethylene membrane positioned over the outside of said supporting disk, said membrane having an annular sealing portion extending beyond the periphery of said disk, the end of said tubular member adjacent said disk being recessed under said annular sealing portion of the membrane, a first sealing ring positioned in said recess inwardly of said annular portion of the membrance, a second sealing ring positioned outwardly of said annular sealing portion of the membrane, said tubular member having a wall portion confining said sealing rings against radially outward movement, and a cap ring having a side wall press-fitted over said tubular member and an inwardly projecting rim engaging said second sealing ring.
Claim 2
Dependent Claim
142 words
A helium gas detection probe comprising a tubular member forming an inlet passage, a perforated suppoRting disk seated in said tubular member over the end of said passage, a solid onepiece polytetrafluoroethylene membrane positioned over the outside of said supporting disk, said membrane having an annular sealing portion extending beyond the periphery of said disk, the end of said tubular member adjacent said disk being recessed under said annular sealing portion of the membrane, a first sealing ring positioned in said recess inwardly of said annular portion of the membrance, a second sealing ring positioned outwardly of said annular sealing portion of the membrane, said tubular member having a wall portion confining said sealing rings against radially outward movement, and a cap ring having a side wall press-fitted over said tubular member and an inwardly projecting rim engaging said second sealing ring.
Claim 3
Dependent Claim
32 words
A leak detection probe as in claim 1 in which the gas inlet area of said membrane is substantially 2 centimeters square and the thickness of the membrane is substantially 2 mils.
Claim 4
Dependent Claim
26 words
A leak detection probe as claimed in claim 1 in which one of said sealing rings is an O-ring and the other is a quad ring.
Claim 5
Dependent Claim
120 words
The helium gas detection probe as claimed in claim 1 wherein said first sealing ring is an O-ring and said second sealing ring is a quad ring, said sealing rings being positioned on opposite sides of said annular sealing portion of the membrane such that press-fitting of said cap ring over said tubular member causes compression of said sealing rings against said annular sealing portion of the membrane whereby the side of said annular sealing portion in contact with said O-ring is caused to acquire a concave contour with respect to said O-ring and the side of said annular sealing portion in contact with said quad ring is caused to acquire a convex contour with respect to said quad ring.
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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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |