US4788090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire resistant plastic pipe
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1987-02-09
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Granted: 1988-11-29
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Expires: 2007-02-09
Abstract
Abstract A novel plastic pipe coated on the outer surface with a thermal insulating layer comprising phenolic foam, and wherein the layer is enclosed in an integrity retaining layer serving as a top or outer layer, comprising fibers, such as glassfibers, which fuse together upon exposure to fire, thereby providing mechanical strength to the foam when the pipe is exposed to fire.
Inventors
- 👤 Paul R. Marks
- 👤 Michael H. Collins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:26
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/145; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1372
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
87 words
A plastic pipe coated at the outer surface thereof with a thermal insulating layer consisting of a phenolic foam wherein said layer is enclosed in an integrity retaining layer serving as a top layer, said integrity retaining layer, comprising fibers which fuse together upon exposure to fire thereby providing mechanical strength to the foam if the pipe is exposed to fire, said integrity retaining layer consisting of a member of the group consisting of an epoxy impregnated woven glassfiber mat and a phenolic impregnated woven glassfiber mat.
Claim 2
Dependent Claim
87 words
A plastic pipe coated at the outer surface thereof with a thermal insulating layer consisting of a phenolic foam wherein said layer is enclosed in an integrity retaining layer serving as a top layer, said integrity retaining layer, comprising fibers which fuse together upon exposure to fire thereby providing mechanical strength to the foam if the pipe is exposed to fire, said integrity retaining layer consisting of a member of the group consisting of an epoxy impregnated woven glassfiber mat and a phenolic impregnated woven glassfiber mat.
Claim 3
Dependent Claim
15 words
The pipe of claim 1, wherein the pipe is made of a glassfiber reinforced resin.
Claim 4
Dependent Claim
106 words
A plastic pipe consisting of a plurality of interconnected pipe sections, and wherein a major part of the wall of each section of the pipe is covered by a continuous layer of thermal insulating material comprising phenolic foam, and wherein the region of each joint interconnecting a pair of adjacent pipe sections is covered by a series of complementary elements of thermal insulating material comprising phenolic foam, and further wherein the outer surface of said elements and said continuous layer is covered by a continuous integrity retaining layer serving as a top layer, said integrity retaining layer comprising fibers which fuse together upon exposure to fire.
Claim 5
Dependent Claim
106 words
A plastic pipe consisting of a plurality of interconnected pipe sections, and wherein a major part of the wall of each section of the pipe is covered by a continuous layer of thermal insulating material comprising phenolic foam, and wherein the region of each joint interconnecting a pair of adjacent pipe sections is covered by a series of complementary elements of thermal insulating material comprising phenolic foam, and further wherein the outer surface of said elements and said continuous layer is covered by a continuous integrity retaining layer serving as a top layer, said integrity retaining layer comprising fibers which fuse together upon exposure to fire.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |