US3949110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Specially formed shrinkable tube, its manufacturing method and the articles using such tube
Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1974-05-07
•
Granted: 1976-04-06
•
Expires: 1994-05-07
Abstract
Abstract A method of manufacturing heat shrinkable tubing having one portion thereof in the form of a single tube and the remaining portion thereof in the form of plural tubes. The heat shrinkable tubing is manufactured by extruding a thermoplastic tube and then longitudinally sealing the tube periodically with applied pressure while the tube is heated to form predetermined plural tube lengths. The tube is then subjected to irradiation, heated to at least the softening temperature of the material of the tube and it is then partially inflated and thermoset by cooling to impart heat shrinkable properties to the tube. The heat shrinkable tube so formed is then periodically cut to form a plurality of heat shrinkable tube sections which each consist of a single tube portion and a remaining plural tube portion.
Inventors
- 👤 Toyoshi Nakajima
- 👤 Keiichi Kojima
- 👤 Hiroshi Nishitani
- 👤 Toshifumi Inui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:00
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/0014; B29C48/00; B29C48/03; B29C48/09; B29C61/00; B29C61/06; B29C61/0608; B29C61/08; B29C65/00; B29C65/02; B29C65/022; B29C65/028; B29C65/18; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4322; B29C66/50; B29C66/51; B29C66/53; B29C66/532; B29C66/5326; B29C66/70; B29C66/73; B29C66/737; B29C66/7371; B29C66/73715; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/818; B29C66/8181; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/8351; B29C66/83511; B29C48/10; B29C48/12; B29C66/114; B29C66/1142; B29L; B29L2023/00; B29L2023/005; B29L2031/00; B29L2031/56; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/1328; Y10T428/1331
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A method of manufacturing heat shrinkable tubing having a special form comprising the steps of extruding a thermoplastic tube having a predetermined diameter, longitudinally sealing said tube periodically with pressure while said tube is heated to form predetermined plural tube lengths, subjecting said tube to irradiation, heating said tube to at least the softening temperature of the material of said tube, partially inflating said heated tube, and thermosetting said inflated tube by cooling to impart heat shrinkable properties thereto.
Claim 2
Independent Claim
79 words
A method of manufacturing heat shrinkable tubing having a special form comprising the steps of extruding a thermoplastic tube having a predetermined diameter, longitudinally sealing said tube periodically with pressure while said tube is heated to form predetermined plural tube lengths, subjecting said tube to irradiation, heating said tube to at least the softening temperature of the material of said tube, partially inflating said heated tube, and thermosetting said inflated tube by cooling to impart heat shrinkable properties thereto.
Claim 3
Dependent Claim
22 words
The manufacturing method as claimed in claim 1, wherein a super-atmospheric pressure is applied to the interior of said tube for inflation.
Claim 4
Dependent Claim
25 words
The manufacturing method as claimed in claim 1 wherein the selected thermoplastic material of said tube is any thermoplastic material which has heat shrinkable properties.
Claim 5
Dependent Claim
38 words
The manufacturing method as claimed in claim 1, including the step of periodically cutting the thermoset tube to form a plurality of heat shrinkable tube sections consisting of a single tube portion and a remaining plural tube portion.
Claim 6
Dependent Claim
49 words
The manufacturing method as claimed in claim 1, wherein the steps of inflating and thermosetting are carried out by passing the heated tube through a cylindrical member while evacuating said member and thereby inflating said tube into contact with the member walls to cool and thermoset the heated tube.
Claim 7
Dependent Claim
132 words
A heat shrinkable tube having one portion thereof in the form of a single tube and the remaining portion thereof in the form of plural tubes, said tube manufactured by the process of extruding a thermoplastic tube having a predetermined diameter, longitudinally sealing said tube periodically with pressure while said tube is heated to form predetermined plural tube lengths, subjecting said tube to irradiation, heating said tube to at least the softening temperature of the material of said tube, partially inflating said heated tube, thermosetting said inflated tube by cooling to impart heat shrinkable properties thereto, and periodically cutting the thermoset tube to form a plurality of heat shrinkable tubes having one portion thereof in the form of a single tube and the remaining portion thereof in the form of plural tubes.
Claim 8
Dependent Claim
132 words
A heat shrinkable tube having one portion thereof in the form of a single tube and the remaining portion thereof in the form of plural tubes, said tube manufactured by the process of extruding a thermoplastic tube having a predetermined diameter, longitudinally sealing said tube periodically with pressure while said tube is heated to form predetermined plural tube lengths, subjecting said tube to irradiation, heating said tube to at least the softening temperature of the material of said tube, partially inflating said heated tube, thermosetting said inflated tube by cooling to impart heat shrinkable properties thereto, and periodically cutting the thermoset tube to form a plurality of heat shrinkable tubes having one portion thereof in the form of a single tube and the remaining portion thereof in the form of plural tubes.
References Cited (Backward Citations)
US3106441A
Cited
US3303243A
Cited
US3490973A
Cited
US3370112A
Cited
US3448182A
Cited
GB1149611A
Cited
US3567259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |