Patent US3756072A successfully refreshed from Google Patents.
US3756072A
Expired / Lapsed
US
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Portable leak test instrument
Assignee: YOUNGSTOWN MILLER CORP
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Filing: 1971-12-27
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Granted: 1973-09-04
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Expires: 1991-12-27
Abstract
Abstract A portable leak test instrument for fluid lines, pressure vessels and other fluid tight systems and enclosures. The instrument has a tank containing a quantity of inert gas under predetermined greater than atmospheric pressure. In order to perform a test, the tank is connected through a pre-set pressure regulator to a first pressure indicating gauge and a line which is adapted to be coupled to the closed system to be tested. The line has a shut-off valve located between the first gauge and the coupling. A second pressure indicating gauge is connected to the line between the shut-off valve and the coupling.
Inventors
- 👤 Murray J Mac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:41
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/26; G01M3/32; G01M3/3209
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
A leak test instrument for a closed fluid system, said instrument comprising, in combination, a tank containing a quantity of inert gas under greater than atmospheric pressure and including a shut-off valve thereon, a pressure regulator, a line connecting said shut-off valve to said pressure regulator, a pressure indicating gauge, a line connecting said pressure regulator to said gauge, a flexible length of coupling line leading from said gauge and terminating in a quick disconnect shut-off coupling, a line status gauging means, a second length of coupling line comprising a length of tubing having a quick disconnect adapter on one end, a connector adapted to be connected to the system to be tested at the other end, a shut-off valve located intermediate such ends, and means for connecting the line status gauging means intermediate the shut-off valve and the connector.
Claim 2
Dependent Claim
140 words
A leak test instrument for a closed fluid system, said instrument comprising, in combination, a tank containing a quantity of inert gas under greater than atmospheric pressure and including a shut-off valve thereon, a pressure regulator, a line connecting said shut-off valve to said pressure regulator, a pressure indicating gauge, a line connecting said pressure regulator to said gauge, a flexible length of coupling line leading from said gauge and terminating in a quick disconnect shut-off coupling, a line status gauging means, a second length of coupling line comprising a length of tubing having a quick disconnect adapter on one end, a connector adapted to be connected to the system to be tested at the other end, a shut-off valve located intermediate such ends, and means for connecting the line status gauging means intermediate the shut-off valve and the connector.
Claim 3
Dependent Claim
131 words
A leak test instrument according to claim 1 in which the tank, the pressure regulator and the first pressure indicating gauge are normally connected to each other and to the flexible length of coupling line, the second length of coupling line is detachable therefrom at the quick disconnect coupling, the line status gauging means comprises a pressure indicating gauge, a hanger means attached to the gauge for hanging the gauge on the system to be tested, whereby the gauge may be easily observed, and a length of flexible tubing leading from the gauge and terminating in a quick-disconnect coupling, and the connecting means in the second length of coupling line comprises a quick-disconnect adapter, whereby the test instrument readily may be connected in testing relationship and disconnected for storage and portability.
Claim 4
Dependent Claim
16 words
A leak test instrument according to claim 2 in which the inert gas is carbon dioxide.
References Cited (Backward Citations)
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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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |