Patent US4088628A successfully refreshed from Google Patents.
US4088628A
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Atactic polypropylene tape
Assignee: ESB Inc
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Filing: 1976-08-12
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Granted: 1978-05-09
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Expires: 1996-08-12
Abstract
Abstract A tape comprised of an atactic polypropylene and a non-conductive filler is described. This tape is useful in a process which enables a secondary battery having a defective seal to be repaired safely while remaining in operation.
Inventors
- 👤 Philip Bernstein
- 👤 James P. Coffey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:19
CPC Classifications
C; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/12; H; H01; H01B; H01B3/00; H01B3/002; H01B3/006; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01M; H01M50/00; H01M50/10; H01M50/183; C08; C08L; C08L2666/00; C08L2666/54; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
36 words
A tape consisting essentially of (a) 95 - 60% by weight atactic polypropylene, and (b) 5 - 40% by weight non-conductive carbon black having particles of a size capable of passing through a 70 mesh sieve.
Claim 2
Dependent Claim
36 words
A tape consisting essentially of (a) 95 - 60% by weight atactic polypropylene, and (b) 5 - 40% by weight non-conductive carbon black having particles of a size capable of passing through a 70 mesh sieve.
Claim 3
Dependent Claim
75 words
The tape of claim 1, wherein the atactic polypropylene has a softening point determined of ASTM-E28-51 of 100° to 110° C, a viscosity determined by Brookfield Thermosel system of 5000 to 9000 centipoises at 149° C, and a density determined by ASTM-D792 at 23° C of 0.82-0.90 grams per cubic centimeter; and wherein the carbon black is a thermal black having a specific gravity of about 1.80 and a moisture content of about 0.5% maximum.
Claim 4
Dependent Claim
26 words
The tape of claim 2 wherein the polypropylene concentration is 75 to 85% by weight and the carbon black concentration is 25 to 15% by weight.
Claim 5
Dependent Claim
8 words
The tape of claim 1 formed by extrusion.
Claim 6
Dependent Claim
8 words
The tape of claim 2 formed by extrusion.
References Cited (Backward Citations)
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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) | 1981-05-08 | 1981-11-07 | 1982-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-08 | 1985-11-07 | 1986-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-08 | 1989-11-07 | 1990-05-09 | $7700.00 | Window Closed / Lapsed |