Patent US3891489A successfully refreshed from Google Patents.
US3891489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure cure method of making resin pipe
Assignee: Ameron Inc
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Filing: 1969-11-24
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Granted: 1975-06-24
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Expires: 1989-11-24
Abstract
Abstract A chemical resistant pipe having a resin-rich liner and a filament wound wall, the pipe being substantially free of trapped air pockets and pits, and a pressure cure method of making same. In a preferred embodiment, the pipe comprises a polyester resin liner reinforced with an angel-hair glass surfacing mat and asbestos web and surrounded by a glass filament wound wall. The pipe is produced by wrapping resin-impregnated reinforcement about a mandrel to form the liner, spiral winding glass roving over the liner to form the wall, placing the mandrel and uncured pipe into a pressure chamber, introducing gas under pressure into the chamber external to the mandrel, and rapidly heating the mandrel interior to accomplish curing of the resin.
Inventors
- 👤 Dalton W Bordner
- 👤 Harlan H Kline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:05
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/133; F16L9/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
106 words
THE IMPROVEMENT IN THE MANUFACTURE OF RESIN PIPE, COMPRISING: WINDING AN UNCURED RESIN IMPREGNATED PIPE ON A MANDREL, RAPIDLY HEATING SAID PIPE TO A TEMPERATURE IN THE RANGE OF FROM 200*F TO 400*F FROM THE INTERIOR OF SAID MANDREL TO CURE SAID RESIN, SAID HEATING BEING SUFFICIENTLY RAPID SO THAT THE HEAT-UP PROFILES AT DIFFERENT RADII WITHIN SAID PIPE ARE SUBSTANTIALLY UNIFORM, SUBJECTING THE UNENVELOPED PIPE, DURING SAID HEATING, TO PNEUMATIC PRESSURE PROVIDED BY EXPOSING SAID PIPE EXTERIOR DIRECTLY TO GAS UNDER PRESSURE OF AT LEAST 35 PSIG; AND ROTATING SAID PIPE AND MANDREL DURING SAID HEATING TO PREVENT UNCURED RESIN FROM DRAINING FROM SAID PIPE.
Claim 2
Dependent Claim
106 words
THE IMPROVEMENT IN THE MANUFACTURE OF RESIN PIPE, COMPRISING: WINDING AN UNCURED RESIN IMPREGNATED PIPE ON A MANDREL, RAPIDLY HEATING SAID PIPE TO A TEMPERATURE IN THE RANGE OF FROM 200*F TO 400*F FROM THE INTERIOR OF SAID MANDREL TO CURE SAID RESIN, SAID HEATING BEING SUFFICIENTLY RAPID SO THAT THE HEAT-UP PROFILES AT DIFFERENT RADII WITHIN SAID PIPE ARE SUBSTANTIALLY UNIFORM, SUBJECTING THE UNENVELOPED PIPE, DURING SAID HEATING, TO PNEUMATIC PRESSURE PROVIDED BY EXPOSING SAID PIPE EXTERIOR DIRECTLY TO GAS UNDER PRESSURE OF AT LEAST 35 PSIG; AND ROTATING SAID PIPE AND MANDREL DURING SAID HEATING TO PREVENT UNCURED RESIN FROM DRAINING FROM SAID PIPE.
Claim 3
Dependent Claim
21 words
The improvement of claim 1 wherein said resin comprises a polyester and wherein said gas is one of nitrogen or CO2.
Claim 4
Dependent Claim
89 words
A process for the manufacture of resin pipe, said process comprising the steps of: forming an uncured resin pipe on a mandrel, placing said pipe and mandrel in a pressure chamber with no shielding material around said pipe, introducing gas into said chamber under sufficient pressure to compress the resin portions of said unshielded pipe, internally heating said mandrel while said pipe is exposed to the pressure of said gas, and rotating said mandrel and pipe during said heating to prevent uncured resin from draining from said unshielded pipe.
Claim 5
Dependent Claim
89 words
A process for the manufacture of resin pipe, said process comprising the steps of: forming an uncured resin pipe on a mandrel, placing said pipe and mandrel in a pressure chamber with no shielding material around said pipe, introducing gas into said chamber under sufficient pressure to compress the resin portions of said unshielded pipe, internally heating said mandrel while said pipe is exposed to the pressure of said gas, and rotating said mandrel and pipe during said heating to prevent uncured resin from draining from said unshielded pipe.
Claim 6
Dependent Claim
29 words
A process as defined in claim 3 wherein said mandrel is heated to a temperature between about 200*F and 400*F, and wherein said pressure is at least 35 psig.
Claim 7
Dependent Claim
17 words
A process as defined in claim 3 wherein said gas comprises one of air, nitrogen or CO2.
Claim 8
Dependent Claim
23 words
A process as defined in claim 3 wherein said resin comprises a polyester and wherein said gas comprises one of nitrogen or CO2.
Claim 9
Dependent Claim
25 words
A process as defined in claim 3 wherein said resin comprises a furan or a phenolic and wherein said pressure is at least 60 psig.
Claim 10
Dependent Claim
13 words
A process as defined in claim 3 wHerein said mandrel is steam heated.
Claim 11
Dependent Claim
30 words
A process as defined in claim 3 wherein said forming comprises: wrapping resin-impregnated surfacing mat about said mandrel, and spiral-winding resin-impregnated glass filament or roving about said wrapped surfacing mat.
Claim 12
Dependent Claim
45 words
A process as defined in claim 3 wherein said forming comprises: wrapping alternating layers of resin-impregnated surfacing mat and resin-impregnated asbestos about said mandrel to form a pipe liner, and spiral-winding resin-impregnated glass filament or roving about said pipe liner to form a pipe wall.
Claim 13
Dependent Claim
23 words
A process as defined in claim 10 wherein said resin comprises a polyester, and wherein said gas comprises one of nitrogen or CO2.
Claim 14
Dependent Claim
17 words
A process as defined in claim 11 wherein said gas is under pressure of about 60 psig.
Claim 15
Dependent Claim
156 words
A process for the manufacture of resin pipe, comprising the steps of: wrapping layers of epoxy or polyester-resin-impregnated fibrous material about a mandrel to form a pipe liner, spiral winding epoxy or polyester-resin-impregnated glass filament or roving about said pipe liner to form a pipe wall, placing said mandrel, pipe liner and pipe wall, uncovered by a protective envelope or bag, within a pressure chamber, introducing air, nitrogen or CO2 gas into said pressure chamber to expose directly said pipe exterior to gas under pressure of at least 35 psig, heating said mandrel to a temperature of between about 200*F and 400*F, thereby heating said pipe liner and pipe wall sufficiently rapidly so that the heat-up profiles at different radii within said pipe are substantially uniform, and rotating said mandrel and pipe during said heating and while subjecting said pipe to said gas under pressure, to prevent uncured resin from draining or dripping from said pipe.
Claim 16
Dependent Claim
156 words
A process for the manufacture of resin pipe, comprising the steps of: wrapping layers of epoxy or polyester-resin-impregnated fibrous material about a mandrel to form a pipe liner, spiral winding epoxy or polyester-resin-impregnated glass filament or roving about said pipe liner to form a pipe wall, placing said mandrel, pipe liner and pipe wall, uncovered by a protective envelope or bag, within a pressure chamber, introducing air, nitrogen or CO2 gas into said pressure chamber to expose directly said pipe exterior to gas under pressure of at least 35 psig, heating said mandrel to a temperature of between about 200*F and 400*F, thereby heating said pipe liner and pipe wall sufficiently rapidly so that the heat-up profiles at different radii within said pipe are substantially uniform, and rotating said mandrel and pipe during said heating and while subjecting said pipe to said gas under pressure, to prevent uncured resin from draining or dripping from said pipe.
Claim 17
Dependent Claim
25 words
A process according to claim 13 wherein said pipe liner and pipe wall both are polyester-resin-impregnated, and wherein said introduced gas is nitrogen or CO2.
Claim 18
Dependent Claim
156 words
A process for the manufacture of resin pipe, comprising the steps of: wrapping layers of furan or phenolic-resin-impregnated fibrous material about a mandrel to form a pipe liner, spiral winding furan or phenolic-resin-impregnated glass filament or roving about said pipe liner to form a pipe wall, placing said mandrel, pipe liner and pipe wall, uncovered by a protective envelope or bag, within a pressure chamber, introducing air, nitrogen or CO2 gas into said pressure chamber to expose directly said pipe exterior to gas under pressure of at least 60 psig, heating said mandrel to a temperature of between about 200*F and 400*F, thereby heating said pipe liner and pipe wall sufficiently rapidly so that the heat-up profiles at different radii within said pipe are substantially uniform, and rotating said mandrel and pipe during said heating and while subjecting said pipe to said gas under pressure, to prevent uncured resin from draining or dripping from said pipe.
Claim 19
Dependent Claim
156 words
A process for the manufacture of resin pipe, comprising the steps of: wrapping layers of furan or phenolic-resin-impregnated fibrous material about a mandrel to form a pipe liner, spiral winding furan or phenolic-resin-impregnated glass filament or roving about said pipe liner to form a pipe wall, placing said mandrel, pipe liner and pipe wall, uncovered by a protective envelope or bag, within a pressure chamber, introducing air, nitrogen or CO2 gas into said pressure chamber to expose directly said pipe exterior to gas under pressure of at least 60 psig, heating said mandrel to a temperature of between about 200*F and 400*F, thereby heating said pipe liner and pipe wall sufficiently rapidly so that the heat-up profiles at different radii within said pipe are substantially uniform, and rotating said mandrel and pipe during said heating and while subjecting said pipe to said gas under pressure, to prevent uncured resin from draining or dripping from said pipe.
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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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |