Patent US3781383A successfully refreshed from Google Patents.
US3781383A
Expired / Lapsed
US
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Impact vinyl aromatic polymers and their preparation
Assignee: Foster Grant Co Inc
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Filing: 1972-01-24
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Granted: 1973-12-25
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Expires: 1992-01-24
Abstract
Abstract IMPACT VINYL AROMATIC POLYMERS HAVING IMPROVED SURFACE APPEARANCE, GOOD IMPACT AND TENSILE STRENGTHS AND GOOD FLOW CHARACTERISTICS ARE PREPARED BY MASS POLYMERIZING, UNTIL ABOUT 2 TO 15% OF THE MONOMER HAS BEEN CONVERTED TO POLYMER, AT LEAST ONE MONOVINYL AROMATIC COMPOUND HAVING DISSOLVED THEREIN AT LEAST ONE 1,3-BUTADIENE RUBBERY POLYMER, ADDING A MERCAPTAN MOLECULAR WEIGHT MODIFYING AGENT TO THE POLYMERIZATION MIXTURE AND COMPLETING THE POLYMERIZATION.
Inventors
- 👤 A Finestone
- 👤 R Westphal
- 👤 C Brac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:37
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |