Patent US3265769A successfully refreshed from Google Patents.
US3265769A
Expired / Lapsed
US
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Biaxially oriented polypropylene film containing butyl rubber
Assignee: 3M Co
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Filing: 1961-10-09
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Granted: 1966-08-09
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Expires: 1981-10-09
Abstract
No abstract record available.
Inventors
- 👤 Albert N Schaffhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:10
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L23/18; C08L23/20; C08L23/22; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/266; Y10T428/28
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
A BIAXIALLY ORIENTED FILM HAVING UNIFORM THICKNESS ON THE ORDER OF ABOUT A MIL AND A TENSILE STRENGTH EXCEEDING THAT OF UNORIENTED ISOTACTIC POLYPROPYLENE, SAID FILM BEING FORMED FROM AN INTIMATE BLEND OF FROM 1 TO 50 PARTS OF BUTYL RUBBER WHICH IS A COPOLYMER OF ISOBUTYLENE AND A SMALL AMOUNT OF ISOPRENE AND CORRESPONDINGLY FROM 99 TO 50 PARTS OF ISOTACTIC POLYPROPLYLENE.
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) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |