Patent US636479A successfully refreshed from Google Patents.
Patent US4779652A successfully refreshed from Google Patents.
US4779652A
Expired / Lapsed
US
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Unitary double wall piping system
Assignee: CITIZENS TRUST Co
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Filing: 1987-04-09
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Granted: 1988-10-25
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Expires: 2007-04-09
Abstract
Abstract Piping for transport of hazardous fluids is provided by replacing old-fashioned two pipe sections and a fitting type double wall piping by a unitary, integrally molded body of fusible plastic having inner and outer pipe walls supported by ribs between the walls, the ribs serving to carry the inner wall plastic within the mold, and being foreshortened at the junction of successive piping bodies to permit cross-flow of any liquids between the inner and outer wall from the point of inception to the place of detection.
Inventors
- 👤 John M. Sweeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:35
CPC Classifications
F; F16; F16L; F16L39/00; F16L9/00; F16L9/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
143 words
For use in a piping, system a modular component usable in series and comprising a unitary plastic body having inner and outer piping walls with respective first and second ends adapted for assembly in series by bodily abutment end to end and a plurality of circumferentially distributed ribs formed integrally with and supporting said piping walls in spaced relation, said ribs being axially elongated without interruption along substantially the length of said body to almost to said end abutments and defining a circumferentially divided chamber between said walls in which leakage from the inner pipe is collectible, said ribs being adapted to continue said chamber from component to component in a series of said components, whereby the presence of leakage at any division of the chamber can be sensed in any other division of the chamber anywhere in a series of said components.
Claim 2
Dependent Claim
143 words
For use in a piping, system a modular component usable in series and comprising a unitary plastic body having inner and outer piping walls with respective first and second ends adapted for assembly in series by bodily abutment end to end and a plurality of circumferentially distributed ribs formed integrally with and supporting said piping walls in spaced relation, said ribs being axially elongated without interruption along substantially the length of said body to almost to said end abutments and defining a circumferentially divided chamber between said walls in which leakage from the inner pipe is collectible, said ribs being adapted to continue said chamber from component to component in a series of said components, whereby the presence of leakage at any division of the chamber can be sensed in any other division of the chamber anywhere in a series of said components.
Claim 3
Dependent Claim
17 words
Piping system according to claim 1, in which said modular components are formed of heat fusible plastic.
Claim 4
Dependent Claim
17 words
Piping system according to claim 1, in which said modular components are formed of solvent fusible plastic.
Claim 5
Dependent Claim
20 words
Piping system according to claim 1, in which said piping walls are annular and define an annular chamber between them.
Claim 6
Dependent Claim
18 words
Piping system according to claim 1, in which said ribs are three in number and uniformly circumferentially spaced.
Claim 7
Dependent Claim
20 words
Piping system according to claim 1, in which said ribs are inset relative to the ends of said component bodies.
Claim 8
Dependent Claim
30 words
Piping system according to claim 6, in which said rib inset is at least sufficient for butt-bonding by heat fusion of successive ones of said modules without softening said ribs.
Claim 9
Dependent Claim
20 words
Piping system according to claim 7, in which said piping walls are annular and define an annular chamber between them.
Claim 10
Dependent Claim
18 words
Piping system according to claim 8, in which said ribs are three in number and uniformly circumferentially spaced.
Claim 11
Dependent Claim
21 words
Piping system according to claim 9, in which said ribs are inset a distance about twice the height of said ribs.
Claim 12
Dependent Claim
16 words
Piping system comprising a series of modular components according to claim 1 in butt joined relation.
Claim 13
Dependent Claim
79 words
Piping system comprising a unitary molded body having in a relatively smaller first cylindrical locus an inner cylindrical pipe wall, in a second relatively larger cylindrical locus an outer cylindrical pipe wall, said first and second loci being free of intersection with each other, and in between said walls in a third cylindrical locus a series of radially disposed ribs uninterrupted other than at the pipe wall ends supporting said pipe walls in their respective first and second loci.
Claim 14
Dependent Claim
79 words
Piping system comprising a unitary molded body having in a relatively smaller first cylindrical locus an inner cylindrical pipe wall, in a second relatively larger cylindrical locus an outer cylindrical pipe wall, said first and second loci being free of intersection with each other, and in between said walls in a third cylindrical locus a series of radially disposed ribs uninterrupted other than at the pipe wall ends supporting said pipe walls in their respective first and second loci.
Claim 15
Dependent Claim
40 words
Piping system module according to claim 12, including also angularly disposed to said inner and outer pipe walls a second set of said inner and outer pipe walls and ribs for changing the direction of a fluid within said module.
References Cited (Backward Citations)
US2475635A
Cited
US4280535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |