US3778799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for pipe lines under gas pressure
Assignee: Cables de Lyon SA
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Filing: 1972-03-28
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Granted: 1973-12-11
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Expires: 1992-03-28
Abstract
Abstract A safety device for interrupting the communication between two pipe line sections, which are under the pressure of gas, in response to detection of propagation or infiltration of a liquid from one section toward the other one, characterized in that it comprises an enclosure including at each of the ends thereof a compartment respectively connected to one of said sections, and in the central portion thereof a chamber separated from each of said compartments by means of a filter retaining a swelling agent which becomes impermeable under the effect of moisture.
Inventors
- 👤 J Bendayan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:28
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/30; Y; Y10; Y10T; Y10T137/00; Y10T137/4456; Y10T137/4643; Y10T137/4651
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A safety device for interrupting the communication between two adjacent sections of pipe under gas pressure in response to the infiltration of water from one section toward the other, comprising a fluid-tight enclosure divided by first and second filtering partitions into a central chamber and respective first and second end compartments connected respectively to said adjacent pipe sections, and a swelling agent disposed in said central chamber which becomes impermeable to fluids upon contact with water.
Claim 2
Dependent Claim
76 words
A safety device for interrupting the communication between two adjacent sections of pipe under gas pressure in response to the infiltration of water from one section toward the other, comprising a fluid-tight enclosure divided by first and second filtering partitions into a central chamber and respective first and second end compartments connected respectively to said adjacent pipe sections, and a swelling agent disposed in said central chamber which becomes impermeable to fluids upon contact with water.
Claim 3
Dependent Claim
26 words
A safety device as defined in claim 1 wherein each of said first and second end compartments further include means for detecting the presence of water.
Claim 4
Dependent Claim
29 words
A safety device as defined in claim 2 wherein said means for detecting the presence of water comprise a pair of closely spaced electrodes connected to a signaling apparatus.
Claim 5
Dependent Claim
54 words
A safety device as defined in claim 2 wherein said means for detecting the presence of water comprise contact means for pro-ducing an electrical connection between a pair of terminals in the presence of water and first and second signaling apparatus connected respectively to the contact means in said first and second end compartments.
Claim 6
Dependent Claim
54 words
A safety device as defined in claim 2 wherein said means for detecting the presence of water comprise contact means for pro-ducing an electrical connection between a pair of terminals in the presence of water and a single signaling apparatus connected in parallel to said contact means in said first and second end compartments.
Claim 7
Dependent Claim
30 words
A safety device as defined in claim 1, further including differential pressure detecting means connected between said adjacent sections of pipe for detecting differences in gas pressure between said secTions.
Claim 8
Dependent Claim
26 words
A safety device as defined in claim 6 wherein each of said first and second end compartments further include means for detecting the presence of water.
Claim 9
Dependent Claim
37 words
A safety device as defined in claim 1 wherein said sections of pipe are electrical waveguides connected together at a junction formed by a fluid-tight membrane, said fluid-tight enclosure being connected to respective sides of said membrane.
Claim 10
Dependent Claim
30 words
A safety device as defined in claim 8, further including differential pressure detecting means connected between said adjacent sections of pipe for detecting differences in gas pressure between said sections.
Claim 11
Dependent Claim
26 words
A safety device as defined in claim 9 wherein each of said first and second end compartments further include means for detecting the presence of water.
Claim 12
Dependent Claim
15 words
A safety device as defined in claim 1 wherein said swelling agent is cellulose particles.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |