Patent US3718495A successfully refreshed from Google Patents.
US3718495A
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US
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Heat-shrinkable pressure-sensitive adhesive tape
Assignee: 3M Co
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Filing: 1971-02-12
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Granted: 1973-02-27
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Expires: 1991-02-12
Abstract
Abstract Heat-shrinkable electrically insulative pressure-sensitive adhesive tape made from 1) a backing selected from polyethylene terephthalate and polyvinyl chloride backings that shrink at a useful elevated temperature at least twice as much in length as in width and shrink within the ranges of 10-50 percent in length and 0-15 percent in width and 2) a pressure-sensitive adhesive that exhibits a high shear strength and a high viscosity.
Inventors
- 👤 J Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:47
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2852; Y10T428/2874; Y10T428/2878; Y10T428/2891; Y10T428/31504; Y10T428/31786; Y10T428/31855
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
44 words
A tape of claim 1 in which the backing shrinks between about 15 and 30 percent in length and between about 5 and 10 percent in width and the pressure-sensitive adhesive exhibits a shear strength value in the described test greater than 500 minutes.
Claim 2
Dependent Claim
16 words
A tape of claim 1 in which the film backing is biaxially-oriented biaxially-differentially heat-shrinkable polyethylene terephthalate.
Claim 3
Dependent Claim
21 words
A tape of claim 1 in which the adhesive is a polymer based on an acrylate of a nontertiary alkyl alcohol.
Claim 4
Dependent Claim
15 words
A tape of claim 1 in which the adhesive is a firm thermosetting rubber-resin adhesive.
Claim 5
Dependent Claim
110 words
Heat-shrinkable pressure-sensitive adhesive tape comprising (1) a strong tough flexible moisture- and solvent-resistant biaxially oriented polyethylene terephthalate backing that shrinks when heated to a useful elevated temperature between about 10 and 50 percent in length and between about 0 and 15 percent in width and at least twice as much in length as in width, and (2) firmly united to one side of the backing a pressure-sensitive adhesive that is tacky cohesive and firm at room temperature and at said elevated temperature and that exhibits a shear strength value in the described test greater than 60 minutes and a viscosity in the described test greater than 1.0 X 106 poises.
Claim 6
Dependent Claim
49 words
A tape of claim 6 in which the film backing shrinks between about 15 and 30 percent in length and between about 5 and 10 percent in width and the pressure-sensitive adhesive exhibits a shear strength value in the described test greater than 500 minutes at said elevated temperature.
Claim 7
Dependent Claim
21 words
A tape of claim 6 in which the adhesive is a polymer based on an acrylate of a nontertiary alkyl alcohol.
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |