Patent US3330786A successfully refreshed from Google Patents.
US3330786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric compositions
Assignee: Foster Grant Co Inc
•
Filing: 1963-03-05
•
Granted: 1967-07-11
•
Expires: 1983-03-05
Abstract
No abstract record available.
Inventors
- 👤 Arnold B Finestone
- 👤 Richard C Westphal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:07
CPC Classifications
C; C08; C08F; C08F279/00; C08F279/02; C08F285/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A METHOD OF PREPARING IMPACT POLYMERS OF IMPROVED MELT INDEX WHICH COMPRISES THE STEPS OF DISSOLVING A RUBBER COMPONENT SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBERS AND SYNTHETIC RUBBERS DERIVED FROM CONJUGATED DIENES IN AN ALKENYL AROMATIC MONOMER, SUBJECTING THE RESULTING SOLUTION TO POLYMERIZING CONDITIONS UNTIL THE POLYMERIZATION MIXTURE HAS A SOLIDS CONTENT OF AT LEAST ABOUT 30% AND BEFORE SUBSTANTIAL COMPLETION OF POLYMERIZATION, ADDING A LOW MOLECULAR WEIGHT ALKENYL AROMATIC POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 5,000 TO 40,000 IN AN AMOUNT BY WEIGHT OF THE FINISHED POLYMER OF FROM ABOUT 0.5 TO ABOUT 15% TO THE PARTIALLY POLYMERIZED RUBBER COMPONENT AND ALKENYL AROMATIC MONOMER, AND SUBJECTING THIS MIXTURE TO POLYMERIZING CONDITIONS TO SUBSTANTIALLY COMPLETE POLYMERIZATION.
Claim 2
Independent Claim
121 words
A METHOD OF PREPARING IMPACT POLYMERS OF IMPROVED MELT INDEX WHICH COMPRISES THE STEPS OF DISSOLVING A RUBBER COMPONENT SELECTED FROM THE GROUP CONSISTING OF NATURAL RUBBERS AND SYNTHETIC RUBBERS DERIVED FROM CONJUGATED DIENES IN AN ALKENYL AROMATIC MONOMER, SUBJECTING THE RESULTING SOLUTION TO POLYMERIZING CONDITIONS UNTIL THE POLYMERIZATION MIXTURE HAS A SOLIDS CONTENT OF AT LEAST ABOUT 30% AND BEFORE SUBSTANTIAL COMPLETION OF POLYMERIZATION, ADDING A LOW MOLECULAR WEIGHT ALKENYL AROMATIC POLYMER HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 5,000 TO 40,000 IN AN AMOUNT BY WEIGHT OF THE FINISHED POLYMER OF FROM ABOUT 0.5 TO ABOUT 15% TO THE PARTIALLY POLYMERIZED RUBBER COMPONENT AND ALKENYL AROMATIC MONOMER, AND SUBJECTING THIS MIXTURE TO POLYMERIZING CONDITIONS TO SUBSTANTIALLY COMPLETE POLYMERIZATION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |