US3131138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of graft copolymers
Assignee: Centre National de la Recherche Scientifique
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Filing: 1959-03-18
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Granted: 1964-04-28
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Expires: 1979-03-18
Abstract
No abstract record available.
Inventors
- 👤 Durup Jean
- 👤 Magat Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:54
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/18; C08F291/185; Y; Y10; Y10S; Y10S8/00; Y10S8/09; Y10S8/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
86 words
A PROCESS FOR THE PRODUCTION OF GRAFT POLYMERS FROM POLYSTYRENE, WHICH COMPRISES IRRADIATING POLYSTYRENE WITH AN EFFECTIVE DOSAGE OF HIGH-ENERGY IONIZING RADIATION TO FORM ACTIVE CENTERS WHILE IN CONTACT WITH OXYGEN AND A POLY-HALOGENATED ALKANE SOLVENT CAPABLE OF PRODUCING WHEN IRRADIATED WITH HIGH ENERGY IONIZING RADIATION IN THE PRESENCE OF OXYGEN A HIGH YIELD OF FREE RADICALS WITHOUT UNDERGOING A CHAIN OXIDATION, AND THEREAFTER CONTACTING THE IRADIATED POLYSTYRENE WITH A MONOMER CAPABLE OF POLYMERIZING IN THE PRESENCE OF FREE RADICALS AND RECOVERING THE GRAFT POLYMER FORMED.
References Cited (Backward Citations)
FR1130100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |