US3985951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulator including a polymeric resin foam forming composition and method of insulation
Assignee: Clarcor Inc
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Filing: 1975-07-10
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Granted: 1976-10-12
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Expires: 1995-07-10
Abstract
Abstract Disclosure is made of a novel sheath and the method of its use for protecting electrical conductors and connections. The sheath comprises a tubular body which defines an interior space. The space contains an expandable, synthetic, polymeric resin foam forming composition. The method of the invention comprises inserting an electrical conductor or connection into the sheath of the invention and activating the foam forming composition to foam and encapsulate the conductor or connection. The installed sheaths protect the conductors and/or connections from degradation by environmental conditions, are resilient and improve the insulative quality of the electrical connection.
Inventors
- 👤 Robert L. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:47
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/56; H01B17/58; B; B29; B29C; B29C44/00; B29C44/02; B29C44/12; B29C44/18; B29C44/188; H01B7/00; H01B7/17; H01B7/28; H01B7/282; H01B7/285; H01B7/2855; H01R; H01R4/00; H01R4/22; H01R13/00; H01R13/46; H01R13/52; H01R13/5216; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10S264/00; Y10S264/05; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249976; Y10T428/249987; Y10T428/249991; Y10T428/249992
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A sheath for protecting electrical conductors and connections, which comprises; a tubular body having first and second ends, said body with said ends defining an empty space to receive and enclose electrical conductors and connections, and an unfoamed, expandable, synthetic, polymeric resin foam forming composition coating the inside walls of said tubular body.
Claim 2
Dependent Claim
53 words
A sheath for protecting electrical conductors and connections, which comprises; a tubular body having first and second ends, said body with said ends defining an empty space to receive and enclose electrical conductors and connections, and an unfoamed, expandable, synthetic, polymeric resin foam forming composition coating the inside walls of said tubular body.
Claim 3
Dependent Claim
15 words
A sheath according to claim 1 wherein said tubular body is closed at one end.
Claim 4
Dependent Claim
23 words
A sheath according to claim 1 wherein said tubular body is fabricated from a flexible, oriented thermoplastic material having a heat activatable memory.
Claim 5
Dependent Claim
13 words
A sheath according to claim 3 wherein said thermoplastic material is polyethylene terephthalate.
Claim 6
Dependent Claim
16 words
A sheath according to claim 1 wherein said tubular body is electrically non-conductive and thermally conductive.
Claim 7
Dependent Claim
16 words
A sheath according to claim 1 wherein said composition is a closed cell foam forming composition.
Claim 8
Dependent Claim
31 words
A sheath according to claim 1 wherein said foam foaming composition comprises a polymer resin dispersion in admixture with a blowing agent which decomposes under actinic radiation to produce nitrogen gas.
Claim 9
Dependent Claim
16 words
A sheath according to claim 7 wherein said composition comprises a polyamide resin and p-toluenesulfonyl hydrazide.
Claim 10
Dependent Claim
15 words
A sheath according to claim 7 wherein said composition comprises a polyester resin and 2,2'-azobisisobutyronitrile.
Claim 11
Dependent Claim
29 words
A sheath according to claim 7 wherein said foam forming composition will form a foam having a density of from about 2 to about 4 pounds per cubic foot.
Claim 12
Dependent Claim
13 words
A sheath according to claim 7 wherein said actinic radiation is infra-red radiation.
References Cited (Backward Citations)
US2186793A
Cited
US3243211A
Cited
US3420363A
Cited
NL6803179A
Cited
DE1920637A1
Cited
US3836702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |