US3939873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant glass-reinforced plastic pipe liner
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1974-06-07
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Granted: 1976-02-24
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Expires: 1994-06-07
Abstract
Abstract An inner liner for glass-reinforced plastic pipes comprising a nonwoven fabric bonded to each side of a plastic film. In the manufacture of pipe, the composition is saturated with the plastic resin, e.g., polyester resin, and wound onto the pipe mandrel. The resin-glass body of the pipe is then wound over the liner and the entire composition cured. The liner prevents damage to the pipe as a result of corrosive material, e.g., mineral acids.This is a division, of Ser. No. 391,866 filed Aug. 27, 1973.
Inventors
- 👤 James W. Rinker
- 👤 William M. Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:35
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/16; B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; Y; Y10; Y10S; Y10S138/00; Y10S138/02; Y10S138/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
80 words
A reinforced plastic pipe wherein said reinforced pipe is made by impregnating the reinforcing material with a curable plastic resin and curing said reinforcing material-resin composite which comprises: a. an innerliner of a composition comprising a central barrier core of flexible thermoplastic material sandwiched between two porous members, said liner being impregnated with a curable plastic resin; and b. an overlayer of resin impregnated glass reinforcing material selected from the group consisting of glass mat, glass fabric and mixtures thereof.
Claim 2
Dependent Claim
80 words
A reinforced plastic pipe wherein said reinforced pipe is made by impregnating the reinforcing material with a curable plastic resin and curing said reinforcing material-resin composite which comprises: a. an innerliner of a composition comprising a central barrier core of flexible thermoplastic material sandwiched between two porous members, said liner being impregnated with a curable plastic resin; and b. an overlayer of resin impregnated glass reinforcing material selected from the group consisting of glass mat, glass fabric and mixtures thereof.
Claim 3
Dependent Claim
54 words
The plastic pipe of claim 1 wherein a. the core material material is polyethylene or polypropylene having a thickness of about 10 to about 30 mils; b. the porous fibrous material is nonwoven polyethylene, nonwoven polypropylene, nonwoven polyethylene terphthalate or nonwoven glass mat; and c. the resin is a polyester resin or epoxy resin.
Claim 4
Dependent Claim
82 words
A reinforced plastic pipe wherein said pipe comprises at least one layer of a reinforcing element impregnated with a curable resin selected from the group consisting of polyester resin and epoxy resins, the reinforcing element-curable resin composition being exposed to curing conditions, thereby bringing the resin to a fully cured state wherein said reinforcing element comprises a central core of a thermoplastic flexible polymeric material sandwiched between two layers of a porous element, said porous element being thermally bonded to said core.
Claim 5
Dependent Claim
82 words
A reinforced plastic pipe wherein said pipe comprises at least one layer of a reinforcing element impregnated with a curable resin selected from the group consisting of polyester resin and epoxy resins, the reinforcing element-curable resin composition being exposed to curing conditions, thereby bringing the resin to a fully cured state wherein said reinforcing element comprises a central core of a thermoplastic flexible polymeric material sandwiched between two layers of a porous element, said porous element being thermally bonded to said core.
Claim 6
Dependent Claim
14 words
The composition of claim 3 wherein said pipe comprises a multiplicity of reinforcing elements.
Claim 7
Dependent Claim
14 words
The composition of claim 4 wherein the pipe comprises two layers of reinforcing element.
Claim 8
Dependent Claim
41 words
The reinforced plastic pipe of claim 3 wherein the core material is polyethylene or polypropylene, the porous element comprises nonwoven polyethylene, nonwoven polypropylene, nonwoven polyethylene terphthalate, nonwoven glass mat or steel wool and the plastic resin is polyester or epoxy resin.
Claim 9
Dependent Claim
19 words
The composition of claim 3 wherein the porous material is a fibrous porous material, cellulose sponge or polyurethane sponge.
Claim 10
Dependent Claim
72 words
A composite reinforced plastic pipe which comprises: a. an innerliner of a composition comprising a central barrier core of elastomeric material selected from the group consisting of butyl rubber, natural rubber, and styrene butadiene rubber sandwiched between two porous members, said liner being impregnated with a curable plastic resin; and b. an overlayer of resin impregnated glass reinforcing material selected from the group consisting of glass mat, glass fabric and mixtures thereof.
Claim 11
Dependent Claim
72 words
A composite reinforced plastic pipe which comprises: a. an innerliner of a composition comprising a central barrier core of elastomeric material selected from the group consisting of butyl rubber, natural rubber, and styrene butadiene rubber sandwiched between two porous members, said liner being impregnated with a curable plastic resin; and b. an overlayer of resin impregnated glass reinforcing material selected from the group consisting of glass mat, glass fabric and mixtures thereof.
Claim 12
Dependent Claim
40 words
The plastic pipe of claim 8 wherein the porous members are selected from the group consisting of nonwoven polyethylene, nonwoven polypropylene, nonwoven polyethylene terphthalate or nonwoven glass mat and the curable plastic resin is a polyester resin or epoxy resin.
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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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |