Patent US4776207A successfully refreshed from Google Patents.
US4776207A
Expired / Lapsed
US
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Leak detectors
Assignee: Edwards Vacuum LLC
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Filing: 1987-05-07
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Granted: 1988-10-11
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Expires: 2007-05-07
Abstract
Abstract Apparatus for leak testing an article by detecting with a vacuum detector the leakage of search gas through the article, the apparatus including a pumping system predominantly for evacuating the article under test together with an auxiliary pumping system for evacuating a search gas detector responsible to the search gas leaking through the article.
Inventors
- 👤 Alan E. Holme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:11
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
142 words
Apparatus for leak testing an article by detecting with a vacuum detector the leakage of search gas through the article, the apparatus including an inlet to the article under test, a search gas detector responsive to the seach gas leaking through the article, a pumping system including a diffusion pump or turbomolecular pump predominantly for evacuating the article under test and an auxiliary pumping system including a diffusion pump or turbomolecular pump for evacuating the search gas dectector wherein the pumping system and the auxiliary pumping system are connected substantially at the inlets of the article under test and the seach gas detector, respectively, and the connection is by way of a restrictive orfice located between the article under test and the search gas detector and sized to ensure that the search gas detector is pumped predominantly by the auxiliary pumping system.
Claim 2
Dependent Claim
142 words
Apparatus for leak testing an article by detecting with a vacuum detector the leakage of search gas through the article, the apparatus including an inlet to the article under test, a search gas detector responsive to the seach gas leaking through the article, a pumping system including a diffusion pump or turbomolecular pump predominantly for evacuating the article under test and an auxiliary pumping system including a diffusion pump or turbomolecular pump for evacuating the search gas dectector wherein the pumping system and the auxiliary pumping system are connected substantially at the inlets of the article under test and the seach gas detector, respectively, and the connection is by way of a restrictive orfice located between the article under test and the search gas detector and sized to ensure that the search gas detector is pumped predominantly by the auxiliary pumping system.
Claim 3
Dependent Claim
21 words
Apparatus as claimed in claimed 1 in which an independent roughing pump is provided for initially evacuating the search gas detector.
Claim 4
Dependent Claim
23 words
Apparatus as claimed in claim 1 in which the pumping system together with the auxiliary pumping system are contained within the apparatus housing.
Claim 5
Dependent Claim
40 words
Apparatus as claimed in claim 3 in which the restrictive office is sized to ensure that a rise in gas pressure within the chamber under test, does not produce a corresponding rise in gas pressure within the search gas detector.
Claim 6
Dependent Claim
128 words
Apparatus for leak testing an article by detecting with a vacuum detector the leakage of search gas through the article, the apparatus including an inlet to the article under test, a search gas detector responsive to the search gas leaking through the article, a pumping system predominantly for evacuating the article under test, and an auxiliary pumping system for evacuating the search gas detector, wherein the pumping system and the auxiliary pumping system are connected substantially at the inlets of the article under test and the search gas detector, respectively, and the connection is by way of a restrictive orfice sized to ensure that a rise in gas pressure within the chamber under test, does not produce a corresponding rise in gas pressure within the search gas detector.
Claim 7
Dependent Claim
128 words
Apparatus for leak testing an article by detecting with a vacuum detector the leakage of search gas through the article, the apparatus including an inlet to the article under test, a search gas detector responsive to the search gas leaking through the article, a pumping system predominantly for evacuating the article under test, and an auxiliary pumping system for evacuating the search gas detector, wherein the pumping system and the auxiliary pumping system are connected substantially at the inlets of the article under test and the search gas detector, respectively, and the connection is by way of a restrictive orfice sized to ensure that a rise in gas pressure within the chamber under test, does not produce a corresponding rise in gas pressure within the search gas detector.
Claim 8
Dependent Claim
23 words
Apparatus as claimed in claim 5 in which the pumping system together with the auxiliary pumping system are contained within the apparatus housing.
Claim 9
Dependent Claim
18 words
Apparatus as claimed in claim 6 in which the pumping system includes a diffusion pump or turbomolecular pump.
Claim 10
Dependent Claim
19 words
Apparatus as claimed in claim 7 in which the auxiliary pumping system includes a diffusion pump or turbomolecular pump.
Claim 11
Dependent Claim
19 words
Apparatus as claimed in claim 8 in which the diffusion pump or turbomolecular pump are backed by roughing pump.
Claim 12
Dependent Claim
21 words
Apparatus as claimed in claim 9 in which an independent roughing pump is provided for initially evacuating the search gas detector.
Claim 13
Dependent Claim
17 words
Apparatus as claimed in claim 10 in which the search gas detector is a mass spectrometer head.
References Cited (Backward Citations)
US3342990A
Cited
US3690151A
Cited
US3626760A
Cited
US3762212A
Cited
US4472962A
Cited
US4608866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |