US3565119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament wound reinforced pipe having a vinyl ester resin inner lining
Assignee: Smith Fiberglass Products Inc
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Filing: 1968-10-25
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Granted: 1971-02-23
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Expires: 1988-10-25
Abstract
Abstract Glass reinforced plastic pipe is provided having pretensioned filamentous reinforcements imbedded in a cured resin and having an inner layer or liner of a thermosetting resin prepared from: (1) a polymerizable monomer, such as styrene; and (2) 2-hydroxy alkyl acrylate or methacrylate dicarboxylic acid anhydride partial esters and the oxyalkylated derivatives thereof. Preferably, a release agent is incorporated into the thermosetting resin composition to facilitate removal of the finished pipe from the mandrel.
Inventors
- 👤 William H Pierpont Jr
- 👤 Robert E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:36
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A filament reinforced resin pipe comprising a cured first resin and tensioned strands of longitudinal and helical filaments arranged substantially parallel and transversely, respectively, to the longitudinal axis of said pipe and imbedded in said cured first resin; said pipe containing an inner layer of a cured thermoset second resin prepared from a mixture of a 2-hydroxy alkyl acrylate or methacrylate dicarboxylic acid anhydride partial ester and the oxyalkylated derivatives thereof and a polymerizable monomer, said second resin containing a parting agent compatible with said second resin, which parting agent migrates to the mandrel during cure, said cured thermoset second resin having a greater degree of contraction than the cured first resin which degree of contraction facilitates the removal of the pipe from a mandrel when the pipe is formed.
Claim 2
Dependent Claim
130 words
A filament reinforced resin pipe comprising a cured first resin and tensioned strands of longitudinal and helical filaments arranged substantially parallel and transversely, respectively, to the longitudinal axis of said pipe and imbedded in said cured first resin; said pipe containing an inner layer of a cured thermoset second resin prepared from a mixture of a 2-hydroxy alkyl acrylate or methacrylate dicarboxylic acid anhydride partial ester and the oxyalkylated derivatives thereof and a polymerizable monomer, said second resin containing a parting agent compatible with said second resin, which parting agent migrates to the mandrel during cure, said cured thermoset second resin having a greater degree of contraction than the cured first resin which degree of contraction facilitates the removal of the pipe from a mandrel when the pipe is formed.
Claim 3
Dependent Claim
14 words
The product of claim 1 wherein said filaments are imbedded in cured epoxy resin.
Claim 4
Dependent Claim
13 words
The product as defined in claim 1 wherein said filaments are glass roving.
Claim 5
Dependent Claim
25 words
The product as defined in claim 1 wherein said partial ester is the 2-hydroxy ethyl acrylate-maleic anhydride half ester; and the polymerizable monomer is styrene.
Claim 6
Dependent Claim
18 words
The product as defined in claim 1 wherein said inner layer includes a layer of filament winding therein.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |