Patent US3765980A successfully refreshed from Google Patents.
US3765980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming pipe with integral hole or nozzle pattern
Assignee: COMBINATION ENG Inc
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Filing: 1971-09-24
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Granted: 1973-10-16
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Expires: 1991-09-24
Abstract
Abstract A method for forming pipe from reinforced fiberglass, the pipe having an integral hole or nozzle pattern. A mandrel with removable pins of a specific diameter and configuration placed in a desired array therealong is used as a pattern for resin impregnated reinforced fiberglass which is filament wound on the mandrel to build up the pipe structure.
Inventors
- 👤 W Hurlbut
- 👤 P Liebig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:38
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/583; B29C53/587; B29C53/80; B29C53/82; B29C53/821; B29C53/824; B29K; B29K2309/00; B29K2309/08; B29L; B29L2031/00; B29L2031/737
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A method for forming pipe from reinforced fiberglass, the pipe having a desired integral hole pattern in the wall thereof, the method comprising the steps of: selecting a series of pins of an external coNfiguration so as to serve as a proper pattern for the holes of said desired integral hole pattern; removably placing said series of pins in a mandrel in an array which conforms to said desired integral hole pattern; coating said mandrel and said pins with a release coating; filament winding resin impregnated reinforced fiberglass on said mandrel about said pins to build up the desired pipe structure; and then removing said pins from said mandrel and sliding said desired pipe structure off of said mandrel.
Claim 2
Independent Claim
119 words
A method for forming pipe from reinforced fiberglass, the pipe having a desired integral hole pattern in the wall thereof, the method comprising the steps of: selecting a series of pins of an external coNfiguration so as to serve as a proper pattern for the holes of said desired integral hole pattern; removably placing said series of pins in a mandrel in an array which conforms to said desired integral hole pattern; coating said mandrel and said pins with a release coating; filament winding resin impregnated reinforced fiberglass on said mandrel about said pins to build up the desired pipe structure; and then removing said pins from said mandrel and sliding said desired pipe structure off of said mandrel.
Claim 3
Independent Claim
161 words
A method for forming rigid reinforced fiberglass pipe having a desired integral hole pattern in the wall thereof comprising the steps of: selecting a mandrel of diameter and length so as to serve as a proper pattern for said pipe; selecting a series of pins of an external configuration so as to serve as a proper pattern for the holes of said desired integral hole pattern; placing said series of pins in said mandrel in an array which conforms to said desired integral hole pattern, said pins being placed so as to be removable therefrom; coating said mandrel and said pins with a suitable release coating; rotating said mandrel; winding filaments of resin impregnated reinforced fiberglass on said mandrel with a reciprocatory motion so as to obtain a helical path buildup on said mandrel about said pins to yield the desired pipe structure; and then removing said pins from said mandrel and sliding said desired pipe structure off of said mandrel.
Claim 4
Independent Claim
161 words
A method for forming rigid reinforced fiberglass pipe having a desired integral hole pattern in the wall thereof comprising the steps of: selecting a mandrel of diameter and length so as to serve as a proper pattern for said pipe; selecting a series of pins of an external configuration so as to serve as a proper pattern for the holes of said desired integral hole pattern; placing said series of pins in said mandrel in an array which conforms to said desired integral hole pattern, said pins being placed so as to be removable therefrom; coating said mandrel and said pins with a suitable release coating; rotating said mandrel; winding filaments of resin impregnated reinforced fiberglass on said mandrel with a reciprocatory motion so as to obtain a helical path buildup on said mandrel about said pins to yield the desired pipe structure; and then removing said pins from said mandrel and sliding said desired pipe structure off of said mandrel.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |