US4184001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi layer insulation system for conductors comprising a fluorinated copolymer layer which is radiation cross-linked
Assignee: Champlain Cable Corp
•
Filing: 1978-04-19
•
Granted: 1980-01-15
•
Expires: 1998-04-19
Abstract
Abstract An insulation system for electrical conductors is provided. The insulation system has a layer of polymer selected from ethylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer and ethylene-tetrafluoroethylene terpolymer surrounding the conductor. This layer of polymer is irradiation crosslinked with from 3 to 20 megarads of high energy ionizing irradiation. Bonded to the surface of the irradiation crosslinked layer of polymer is a polyimide coating. The insulation is a high temperature, flame resistant system having a combination of properties useful in the aircraft industry as airframe and hookup wire.
Inventors
- 👤 Nelson Hildreth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:05
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; H01B13/148; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/443; H01B3/445; H01B7/00; H01B7/17; H01B7/29; H01B7/292; H01B7/295; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/31504; Y10T428/3154; Y10T428/31721
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
An insulation system for electrical conductors comprising a first layer of radiation crosslinked polymeric insulation in which the polymer is selected from ethylene-tetrafluoroethylene copolymer, ethylene-tetrafluoroethylene terpolymer, and ethylene-chlorotrifluoroethylene copolymer, which polymer has been crosslinked solely by subjecting said polymer to high energy ionizing radiation, said radiation dose being from 3 megarads to 20 megarads, and a coating comprising a heat curable polyimide adherent to the surface of the crosslinked polymeric insulation.
Claim 2
Dependent Claim
71 words
An insulation system for electrical conductors comprising a first layer of radiation crosslinked polymeric insulation in which the polymer is selected from ethylene-tetrafluoroethylene copolymer, ethylene-tetrafluoroethylene terpolymer, and ethylene-chlorotrifluoroethylene copolymer, which polymer has been crosslinked solely by subjecting said polymer to high energy ionizing radiation, said radiation dose being from 3 megarads to 20 megarads, and a coating comprising a heat curable polyimide adherent to the surface of the crosslinked polymeric insulation.
Claim 3
Dependent Claim
75 words
The insulation system of claim 1 in which the heat curable polyimide is selected from the group consisting of polymers having a member of the group consisting of benzene and naphthalene rings joined to two carbon atoms of a heterocyclic ring having five to six members in the ring, one to two of the atoms of the heterocyclic ring being nitrogen atoms and the balance of the atoms of the heterocyclic ring being carbon atoms.
Claim 4
Dependent Claim
17 words
The insulation system of claim 1 in which the polymer which is irradiation crosslinked is ethylene-tetrafluoroethylene copolymer.
Claim 5
Dependent Claim
17 words
The insulation system of claim 1 in which the polymer which is irradiation crosslinked is ethylene-chlorotrifluoroethylene copolymer.
Claim 6
Dependent Claim
17 words
The insulation system of claim 1 in which the polymer which is irradiation crosslinked is ethylene-tetrafluoroethylene terpolymer.
Claim 7
Dependent Claim
22 words
The insulation system of claims 3, 4 or 5 in which the polyimide is the condensation product of 4,4-oxydianiline and pyromellitic dianhydride.
Claim 8
Dependent Claim
69 words
An insulated electrical conductor comprising (a) an electrical conductor, (b) a first layer of crosslinked polymeric insulator surrounding the electrical conductor, said polymer being selected from ethylene-tetrafluoroethylene copolymer, ethylene-tetrafluoroethylene terpolymer, and ethylene-chlorotrifluoroethylene, copolymer, said polymer being crosslinked solely by subjecting said polymer to from 3 megarads to 20 megarads of high energy ionizing radiation, and (c) a heat curable polyimide adherent to the surface of the crosslinked polymeric insulation.
Claim 9
Dependent Claim
69 words
An insulated electrical conductor comprising (a) an electrical conductor, (b) a first layer of crosslinked polymeric insulator surrounding the electrical conductor, said polymer being selected from ethylene-tetrafluoroethylene copolymer, ethylene-tetrafluoroethylene terpolymer, and ethylene-chlorotrifluoroethylene, copolymer, said polymer being crosslinked solely by subjecting said polymer to from 3 megarads to 20 megarads of high energy ionizing radiation, and (c) a heat curable polyimide adherent to the surface of the crosslinked polymeric insulation.
Claim 10
Dependent Claim
76 words
The insulated conductor of claim 7 in which the heat curable polyimide is selected from the group consisting of polymers having a member selected from the group consisting of benzene and naphthalene rings joined to two carbon atoms of a heterocyclic ring having five to six members in the ring, one to two of the atoms of the heterocyclic ring being nitrogen atoms and the balance of the atoms of the heterocyclic ring being carbon atoms.
Claim 11
Dependent Claim
17 words
The insulated conductor of claim 7 in which the polymer which is irradiation crosslinked is ethylene-tetrafluoroethylene copolymer.
Claim 12
Dependent Claim
17 words
The insulated conductor of claim 7 in which the polymer which is irradiation crosslinked is ethylene-chlorotrifluoroethylene copolymer.
Claim 13
Dependent Claim
17 words
The insulated conductor of claim 7 in which the polymer which is irradiation crosslinked is ethylene-tetrafluoroethylene terpolymer.
References Cited (Backward Citations)
US3168417A
Cited
US3269862A
Cited
US3422215A
Cited
US3579370A
Cited
US3650827A
Cited
US3805218A
Cited
US4031167A
Cited
US4062998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |