US3734843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Irradiation of ethylene/vinyl acetate copolymers
Assignee: EIDP Inc
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Filing: 1970-11-17
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Granted: 1973-05-22
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Expires: 1990-11-17
Abstract
Abstract THE INITIAL MELT INDEX OF ETHYLENE/VINYL ACETATE COPOLYMERS CAN BE SUBSTANTIALLY, I.E., MORE THAN 50 PERCENT, LOWERED BY TREATING THE COPOLYMERS WITH HIGH ENERGY IONIZING RADIATION OF HIGH DOSE RATES, E.G., HIGH ENERGY ELECTRONS. IN THE PRESENT PROCESS THE AMOUNT OF RADIATION EMPLOYED IS LESS THAN THAT WHICH TRANSFORMS THE COPOLYMERS INTO ELASTOMERS AS INDICATED BY THE PRESENCE OF COPOLYMER GEL. GEL FREE IRRADIATED ETHYLENE/VINYL ACETATE COPOLYMERS CONTAINING 15-35 WEIGHT PERCENT VINYL ACETATE ARE EXCEPTIONALLY USEFUL AS WAX ADDITIVES.
Inventors
- 👤 R Tubbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:24
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |