US4101699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic resinous tube
Assignee: FLUROCARBON COMPANY
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Filing: 1973-11-23
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Granted: 1978-07-18
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Expires: 1993-11-23
Abstract
Abstract A synthetic resinous tube having a plurality of bonded coaxial layers with at least one layer being thermoplastic and another substantially non-thermoplastic is formed by the simultaneous coaxial extrusion of thermoplastic tubes and electron irradiation of one of the layers of the tube to convert it from a thermoplastic resin.
Inventors
- 👤 Clifford R. Stine
- 👤 Jennings A. Boyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:30
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/12; F16L9/133; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C71/00; B29C71/04; B29C35/00; B29C35/02; B29C35/08; B29C35/0866; B29C2035/0872; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2067/00; B29K2077/00; B29K2101/00; B29K2101/10; B29K2301/00; B29K2301/10; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10S; Y10S138/00; Y10S138/07; Y10S264/00; Y10S264/45; Y10S264/71; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/139; Y10T428/1393; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31931; Y10T428/31938
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A dimensionally stable tube having a plurality of layers of different polymeric materials cohesively bonded together, said tube having been made by the method comprising simultaneously coaxially extruding a plurality of contiguous tubular layers of different fuse bondable thermoplastic polymeric materials, at least one of the layers being susceptible to cross-linking by electron irradiation and at least one layer being substantially nonsusceptible to cross-linking by electron irradiation, and irradiating the resulting tube until cross-linking of the susceptible thermoplastic layer has progressed to a point where the said susceptible layer is substantially non-thermoplastic, wherein the at least one layer which is susceptible to cross-linking is an ethylene-propylene-diene terpolymer composition and the at least one layer which is substantially non-susceptible to cross-linking is a polyethylene composition.
Claim 2
Dependent Claim
124 words
A dimensionally stable tube having a plurality of layers of different polymeric materials cohesively bonded together, said tube having been made by the method comprising simultaneously coaxially extruding a plurality of contiguous tubular layers of different fuse bondable thermoplastic polymeric materials, at least one of the layers being susceptible to cross-linking by electron irradiation and at least one layer being substantially nonsusceptible to cross-linking by electron irradiation, and irradiating the resulting tube until cross-linking of the susceptible thermoplastic layer has progressed to a point where the said susceptible layer is substantially non-thermoplastic, wherein the at least one layer which is susceptible to cross-linking is an ethylene-propylene-diene terpolymer composition and the at least one layer which is substantially non-susceptible to cross-linking is a polyethylene composition.
References Cited (Backward Citations)
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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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |