US3144430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polypropylene film and method of making
Assignee: 3M Co
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Filing: 1961-10-09
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Granted: 1964-08-11
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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 21:50
CPC Classifications
B; B44; B44D; B44D3/00; B44D3/18; C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/12; C08L35/00; C08L35/08; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A METHOD OF PREPARING WITH MINIMUM WASTE A POLYMERIC FILM HAVING A UNIFORM THICKNESS AND A TENSILE STRENGTH IN MUTALLY PERPENDICULAR DIRECTION EXCEEDING THAT OF UNORIENTED ISOTACTIC POLYPROPYLENE, COMPRISING THE STEPS OF INTIMATELY BLENDING FROM 5 TO 35 PARTS OF CRYSTALLINE POLY(VINYL METHYL ETHER) AND CORRESPONDINGLY FROM 95 TO 65 PARTS OF ISOTACTIC POLYPROPYLENE, FORMING SHEET MATERIAL FROM THE BLENDED POLYMERS, HEATING SAID SHEET MATERIAL TO A TEMPERATURE SLIGHT BELOW ITS MELTING POINT, AND BIAXIALLY ORIENTING SAID SHEET MATERIAL,
Claim 2
Independent Claim
79 words
A METHOD OF PREPARING WITH MINIMUM WASTE A POLYMERIC FILM HAVING A UNIFORM THICKNESS AND A TENSILE STRENGTH IN MUTALLY PERPENDICULAR DIRECTION EXCEEDING THAT OF UNORIENTED ISOTACTIC POLYPROPYLENE, COMPRISING THE STEPS OF INTIMATELY BLENDING FROM 5 TO 35 PARTS OF CRYSTALLINE POLY(VINYL METHYL ETHER) AND CORRESPONDINGLY FROM 95 TO 65 PARTS OF ISOTACTIC POLYPROPYLENE, FORMING SHEET MATERIAL FROM THE BLENDED POLYMERS, HEATING SAID SHEET MATERIAL TO A TEMPERATURE SLIGHT BELOW ITS MELTING POINT, AND BIAXIALLY ORIENTING SAID SHEET MATERIAL,
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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |