US3679562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lower temperature solid phase polymerization of acrylonitrile in the presence of an organic carbonyl compound
Assignee: Japan Atomic Energy Agency
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Filing: 1969-12-15
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Granted: 1972-07-25
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Expires: 1989-12-15
Abstract
Abstract THE PRESENT DISCLOSURE RELATES TO A PROCESS OF SOLID PHASE POLYMERIZATION OF ACRYLONITRILE BY MEANS OF AN IONIZING RADIATION BELOW THE MELTING POINT OF AN ACRYLONITRILE, CHARACTERIZED IN THAT AN ORGANIC CARBONYL COMPOUND OR COMPOUNDS ARE ADDED TO ACRYLONITRILE BEFORE THE POLYMERIZATION THEREOF. THE CARBONYL COMPOUND ADDED TO THE POLYMERIZATION SYSTEM SERVES TO CONTROL THE MOLECULAR WEIGHT OF POLYACRYLONITRILE AND IMPROVE OTHER PHYSICAL PROPERTIES OF THE POLYMER.
Inventors
- 👤 Yoneho Tabata
- 👤 Chihiro Oizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:19
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/36
Claims Analysis
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |