US3820382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting leakages in the vacuum system of motor vehicles
Assignee: Daimler Benz AG
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Filing: 1971-11-04
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Granted: 1974-06-28
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Expires: 1991-11-04
Abstract
Abstract A method and apparatus for detecting leakages in the vacuum system especially of motor vehicles, according to which air is sucked out of the vacuum system and fed to a leak detector apparatus which detects the slightest traces of a test gas, externally charged into the surroundings of the place of the vacuum system where the leak is suspected.
Inventors
- 👤 R Andres
- 👤 H Moller
- 👤 F Seyfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:26
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/025; G01M3/04; G01M3/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A method of detecting leaks in a vacuum system comprising the steps of: supplying a test gas to the surroundings of that place of the vacuum system where a leak is suspected; sucking air out of the vacuum system; feeding said sucked air to a leak detector apparatus; and cooling said leak detector apparatus by supplying atmospheric air by way of a throttle opening to said leak detector apparatus whereby traces of said test gas in the vacuum system will be detected by said leak deTector apparatus.
Claim 2
Independent Claim
87 words
A method of detecting leaks in a vacuum system comprising the steps of: supplying a test gas to the surroundings of that place of the vacuum system where a leak is suspected; sucking air out of the vacuum system; feeding said sucked air to a leak detector apparatus; and cooling said leak detector apparatus by supplying atmospheric air by way of a throttle opening to said leak detector apparatus whereby traces of said test gas in the vacuum system will be detected by said leak deTector apparatus.
Claim 3
Dependent Claim
12 words
A method according to claim 1, wherein said test gas is freon.
Claim 4
Dependent Claim
112 words
A vacuum system leak detecting arrangement comprising: means for supplying a test gas externally to a suspected location of a leak in the vacuum system; means for sucking the air out of the vacuum system; leak detector means for detecting the presence of a test gas; means for supplying said sucked air to said leak detector means; and means for supplying atmospheric air to said leak detector means whereby said detector means detects the slightest traces of test gas in said air sucked out of said vacuum system including throttle means disposed between the vacuum system and said sucking means for the inlet of atmospheric air to cool said leak detector means.
Claim 5
Dependent Claim
112 words
A vacuum system leak detecting arrangement comprising: means for supplying a test gas externally to a suspected location of a leak in the vacuum system; means for sucking the air out of the vacuum system; leak detector means for detecting the presence of a test gas; means for supplying said sucked air to said leak detector means; and means for supplying atmospheric air to said leak detector means whereby said detector means detects the slightest traces of test gas in said air sucked out of said vacuum system including throttle means disposed between the vacuum system and said sucking means for the inlet of atmospheric air to cool said leak detector means.
Claim 6
Dependent Claim
32 words
A detecting arrangement according to claim 3, wherein said means for sucking air out of the vacuum system includes a vacuum pump disposed between the vacuum system and said leak detector means.
Claim 7
Dependent Claim
19 words
A detecting arrangement according to claim 3, wherein said vacuum system includes the vacuum system of a motor vehicle.
Claim 8
Dependent Claim
28 words
A detecting arrangement according to claim 5, wherein said means for supplying a test gas includes a selectively operable means for controlling the flow of the test gas.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |