US4412125A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-shrinkable cover
Assignee: Ube Corp
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Filing: 1982-09-27
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Granted: 1983-10-25
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Expires: 2002-09-27
Abstract
Abstract An electrical heating element material of a sheet form is provided, which is comprised of a web of a synthetic resin having a plurality of metal conductor wires arranged therein in parallel to one another along the longitudinal direction of the web. The web is folded in succession at predetermined intervals along folding lines inclined at a small acute angle to the transverse direction of the web to form a substantially two-layer parallelogrammatic sheet. Considering the small angle, the sheet is, for practical purposes, rectangular. The electrical heating element material is prepared by supplying a plurality of metal conductor wires arranged in parallel to one another into a cross-head type extrusion die, separately supplying a thermoplastic resin into said die, co-extruding the resin together with the wires to form a web, folding the web in succession at predetermined intervals along folding lines inclined at an acute angle to the transverse direction of the web to form the two-layer rectangular sheet, and then, optionally, bonding together the two layers. The electrical heating element material may be used as a heat-shrinkable cover, which is comprised of a heat-shrinkable synthetic resin member and the electrical heating element material combined with the heat-shrinkable resin member substantially over the entire region thereof.
Inventors
- 👤 Toshio Nagasawa
- 👤 Yoshio Nishihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:19
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/685; B29C70/687; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C61/00; B29C61/06; B29C61/0608; B29C61/0625; B29C61/10; B29C65/00; B29C65/02; B29C65/34; B29C65/3404; B29C65/342; B29C65/3428; B29C65/3432; B29C65/344; B29C65/3472; B29C65/3476; B29C66/00; B29C66/70; B29C66/73; B29C66/737; B29C66/7371; B29C66/73715; B29C66/739; B29C66/7392; B29C66/73921; F; F16; F16L; F16L47/00; F16L47/20; F16L47/22; H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/36; H05B3/40; H05B3/54; H05B3/58; B29C48/15; B29C48/156; B29C66/73711; B29C66/73712; H05B2203/00; H05B2203/002; H05B2203/004; H05B2203/005; H05B2203/014; H05B2203/017; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
129 words
A heat-shrinkable cover comprising a heat-shrinkable synthetic resin member and an electrical heating element combined with the heat-shrinkable synthetic resin member substantially over the entire region thereof, wherein the electrical heating element comprises a web of a synthetic resin having a plurality of flexible metal conductor wires arranged therein in parallel to one another along the longitudinal direction of the web, said web being folded in succession at predetermined intervals along folding lines inclined at a small acute angle to the transverse direction of the web to form a two-layer rectangular sheet, and the direction of the folding lines forming the side edges of the two-layer rectangular sheet of the electrical heating element is substantially in agreement with the direction of heat shrinkage of the heat-shrinkable synthetic resin member.
Claim 2
Dependent Claim
129 words
A heat-shrinkable cover comprising a heat-shrinkable synthetic resin member and an electrical heating element combined with the heat-shrinkable synthetic resin member substantially over the entire region thereof, wherein the electrical heating element comprises a web of a synthetic resin having a plurality of flexible metal conductor wires arranged therein in parallel to one another along the longitudinal direction of the web, said web being folded in succession at predetermined intervals along folding lines inclined at a small acute angle to the transverse direction of the web to form a two-layer rectangular sheet, and the direction of the folding lines forming the side edges of the two-layer rectangular sheet of the electrical heating element is substantially in agreement with the direction of heat shrinkage of the heat-shrinkable synthetic resin member.
Claim 3
Dependent Claim
38 words
A heat-shrinkable cover according to claim 1, wherein the heat-shrinkable synthetic resin member is comprised of 2 to 20 films or sheets superposed upon another, each being an uniaxially drawn film or sheet of a crystalline synthetic resin.
Claim 4
Dependent Claim
40 words
A heat-shrinkable cover according to claim 1 or 2, wherein the synthetic resin of the heat-shrinkable member is cross-linked to such an extent that the degree of gel fraction is in the range of from about 20% to about 80%.
Claim 5
Dependent Claim
39 words
A heat-shrinkable cover according to claim 1 or 2, wherein the heat-shrinkable cover has such a laminate structure that the electrical heating element is sandwiched between the layers of uniaxially stretched films or sheets of a crystalline synthetic resin.
Claim 6
Dependent Claim
22 words
A heat-shrinkable cover according to claim 4, wherein both end portions of the laminate structure are interlayer-separated to form branched tongue-like portions.
Claim 7
Dependent Claim
20 words
A heat-shrinkable cover according to claim 1 or 2, wherein the two layers of the rectangular sheet are bonded together.
Claim 8
Dependent Claim
29 words
A heat-shrinkable cover according to claim 1 or 2, wherein a pair of terminals are fitted on both end portions of the folded web having the metal conductor wires.
Claim 9
Dependent Claim
22 words
A heat-shrinkable cover according to claim 1 or 2, wherein the heat-shrinkable cover has a thickness of from 0.5 to 5 mm.
Claim 10
Dependent Claim
47 words
A heat-shrinkable cover according to claim 1 or 2, wherein each of the metal conductor wires has a sectional area of from 0.0001 to 0.8 mm 2 and the distance between every two adjacent parallel metal conductor wires in the web is from 0.3 to 2 cm.
Claim 11
Dependent Claim
57 words
A heat-shrinkable cover according to claim 1 or 2, wherein the synthetic resin of the web has a thickness of from 10 to 500 microns at the portions where no metal conductor wires exist and a thickness of from 10 to 200 microns at the portions where the metal conductor wires are coated with the synthetic resin.
Claim 12
Dependent Claim
30 words
A heat-shrinkable cover according to claim 1 or 2, wherein the folding lines are inclined at an acute angle of 0.5° to 10° to the transverse direction of the web.
Claim 13
Dependent Claim
62 words
A heat-shrinkable cover according to claim 1 or 2, wherein each segment of the folding lines forming the side edges of the two-layer rectangular sheet neither overlaps with the adjacent segments at either of the two end portions thereof over a length of more than one centimeter, nor is separated from the adjacent segments at a distance of more than one centimeter.
Claim 14
Dependent Claim
39 words
A heat-shrinkable cover according to claim 1 or 2, wherein the synthetic resin for the web is cross-linked to such an extent that the degree of gel fraction is in the range of from about 35% to about 65%.
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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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |