US3579609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flex-resistant polyester film containing olefin or polytetramethylene oxide additive polymer
Assignee: 3M Co
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Filing: 1968-09-23
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Granted: 1971-05-18
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Expires: 1988-09-23
Abstract
Abstract PHYSICALLY BLENDING MINOR AMOUNTS OF FUSIBLE HEATSTABLE POLYMERS OF LOWER-MONO-ALPHA OLEFIN OR TETRAMETHYLENE OXIDE INTO POLYESTER RESIN WHICH IS TO BE EXTRUDED INTO A FILM AND THEREAFTER ORIENTED, IMPARTS UNEXPECTEDLY SUPERIOR FLEX RESISTANCE TO THE ULTIMATE FILM. THE FILM ALSO DISPLAYS EXCELLENT "SLIP" AND, IN MANY INSTANCES, IMPROVED ELECTRICAL PROPERTIES. AMONG THE SUITABLE ADDITIVE POLYMERS ARE POLYETHYLENE, POLYPROPYLENE, POLYBUTYLENE, POLY4-METHYL PETENE, ETHYLENE VINYL ACETATE COPOLYMER, ETHYLENE PROPYLENE COPOLYMERS AND POLYTETRAMETHYLENE OXIDE.
Inventors
- 👤 Robert J Sevenich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |