Patent US3858618A successfully refreshed from Google Patents.
US3858618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piping for fire protection systems
Assignee: Factory Mutual Research Corp
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Filing: 1973-01-10
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Granted: 1975-01-07
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Expires: 1993-01-10
Abstract
Abstract A piping in which a plastic tubular member is encased in wire mesh for use in fire sprinkler systems. The mesh substantially protects the tubular member from thermal deterioration. When deterioration does occur, it is generally in the form of pin holes which permit water to flow onto the mesh, cooling it, and preventing further heat transfer to the tubular member.
Inventors
- 👤 John W Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:28
CPC Classifications
F; F16; F16L; F16L57/00; F16L57/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
85 words
Piping for use in fire protection systems, said piping comprising a plastic tubular member, and a woven wire screening material covering said tubular member at least partially in a spaced relationship therewith so as to at least partially insulate said piping from fire and heat deterioration thereby limiting any failure of the tubular member to small pin holes which permit water in the system to escape therethrough, dripping onto the screening material to cool it and prevent further transfer of heat to the tubular member.
Claim 2
Dependent Claim
85 words
Piping for use in fire protection systems, said piping comprising a plastic tubular member, and a woven wire screening material covering said tubular member at least partially in a spaced relationship therewith so as to at least partially insulate said piping from fire and heat deterioration thereby limiting any failure of the tubular member to small pin holes which permit water in the system to escape therethrough, dripping onto the screening material to cool it and prevent further transfer of heat to the tubular member.
Claim 3
Dependent Claim
16 words
The plastic piping as defined in claim 1 wherein said tubular member is formed of polyvinylchloride.
Claim 4
Dependent Claim
21 words
The plastic piping as defined in claim 2 wherein said screening material is a woven wire screen of between 10-20 gauge.
Claim 5
Dependent Claim
15 words
The plastic piping as defined in claim 3 wherein said wire screen is aluminum mesh.
References Cited (Backward Citations)
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US1630895A
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US1838242A
Cited
US2193036A
Cited
US2564602A
Cited
US2787289A
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Cited
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |