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US3950604A
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Heat-shrinkable articles having non-linear electrical resistance characteristics
Assignee: Raychem Ltd
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Filing: 1973-08-31
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Granted: 1976-04-13
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Expires: 1993-08-31
Abstract
Abstract A polymer composition containing silicon carbide of a critical maximum average particle size can be processed into heat-shrinkable articles possessing nonlinear electrical resistance characteristics. An embodiment of the invention provides a heat-shrinkable article comprising a laminate of a layer of elastomer, including silicon carbide particles, and a layer of a heat-shrinkable polymeric material. The elastomeric layer may be a blend of a rubbery polymer and a low density polyethylene having dispersed therein particulate silicon carbide of particle size finer than about 300 grit.
Inventors
- 👤 Richard J. Penneck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:06
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/1806; B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H01C; H01C7/00; H01C7/10; H01C7/105; H01C7/118; H02G15/02; H02G15/06; H02G15/064; H02G15/068; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31924
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
33 words
A heat-shrinkable article possessing nonlinear electrical resistance characteristics comprising a laminate of: a first layer of an elastomer having dispersed therein particulate silicon carbide; and a second layer of a heat-shrinkable polymeric material.
Claim 2
Dependent Claim
33 words
A heat-shrinkable article possessing nonlinear electrical resistance characteristics comprising a laminate of: a first layer of an elastomer having dispersed therein particulate silicon carbide; and a second layer of a heat-shrinkable polymeric material.
Claim 3
Dependent Claim
15 words
The article of claim 1 wherein said first and second layer form a tube member.
Claim 4
Dependent Claim
18 words
The article of claim 2 wherein said first layer is formed on the inside of the tube member.
Claim 5
Dependent Claim
15 words
The article of claim 1 further including a particulate filler dispersed in said first layer.
Claim 6
Dependent Claim
17 words
The article of claim 1 wherein said particulate silicon carbide is about 300 grit size or finer.
Claim 7
Dependent Claim
32 words
The article of claim 1 wherein the elastomer is chosen from the group consisting of a fluoroelastomer, a chlorinated polyethylene, a chlorosulphonated polyethylene, a polyurethane, an acrylate, a silicone and a fluorosilicone.
Claim 8
Dependent Claim
55 words
The article of claim 1, wherein the elastomer is chosen from the group consisting of an ethylene-propylene rubber copolymer wherein the ethylene content is at least about 65%, an ethylene-non-conjugated diene rubber terpolymer wherein the ethylene content is at least about 65% and a butadiene/acrylonitrile rubber containing about 10% to about 40% by weight acrylonitrile.
Claim 9
Dependent Claim
30 words
The article of claim 7, wherein when said elastomer is selected from the group consisting of the copolymer and the terpolymer, the ethylene content thereof being at least about 70%.
Claim 10
Dependent Claim
17 words
The article of claim 11, wherein said particulate silicon carbide is about 300 grit size or finer.
Claim 11
Dependent Claim
42 words
An article capable of being rendered heat-shrinkable and possessing non-linear electrical resistance characteristics comprising of a laminate of: a first layer of an elastomer having dispersed therein particulate silicon carbide; and a second layer of polymeric material capable of being rendered heat-shrinkable.
Claim 12
Dependent Claim
42 words
An article capable of being rendered heat-shrinkable and possessing non-linear electrical resistance characteristics comprising of a laminate of: a first layer of an elastomer having dispersed therein particulate silicon carbide; and a second layer of polymeric material capable of being rendered heat-shrinkable.
Claim 13
Dependent Claim
15 words
The article of claim 10, wherein said first and second layer form a tube member.
Claim 14
Dependent Claim
18 words
The article of claim 11, wherein said first layer is formed on the inside of the tube member.
Claim 15
Dependent Claim
15 words
The article of claim 10, further including a particulate filler dispersed in said first layer.
Claim 16
Dependent Claim
17 words
The article of claim 10, wherein said particulate silicon carbide is about 300 grit size or finer.
Claim 17
Dependent Claim
32 words
The article of claim 10, wherein the elastomer is chosen from the group consisting of a fluoroelastomer, a chlorinated polyethylene, a chlorosulphonated polyethylene, a polyurethane, an acrylate, a silicone and a fluorosilicone.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |