Patent US3012282A successfully refreshed from Google Patents.
US3012282A
Expired / Lapsed
US
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Method of making granules of alkenylaromatic hydrocarbon polymerrubber compositions with improved extrusion characteristics
Assignee: Dow Chemical Co
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Filing: 1960-11-03
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Granted: 1961-12-12
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Expires: 1980-11-03
Abstract
No abstract record available.
Inventors
- 👤 Donald Harold Jack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:11
CPC Classifications
B; B29; B29B; B29B9/00; B29B9/02; B29B9/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
THE METHOD WHICH COMPRISES EXTRUDING A THIN HOT STRIP HAVING A DENSITY FROM 0.9 TO 1.1 OF A COMPOSITION CONSISTING ESSENTIALLY OF A MINOR PROPORTION, FROM 2 TO 20 PERCENT BY WEIGHT, OF A RUBBERY DIENE POLYMERIC MATERIAL AND A PREDOMINANT PROPORTION, CORRESPONDINGLY FROM 98 TO 80 PERCENT BY WEIGHT, OF A MONOALKENYL BENZENE SERIES HYDROCARBON POLYMER, COOLING THE THIN STRIP BELOW ITS SECOND ORDER TRANSITION TEMPERATURE, SUBJECTING THE SO-COOLED STRIP TO A DISTORTING FORCE SUFFICIENT TO CRAZE-CRACK THE SURFACE SO AS TO PROVIDE THEREON WHEN IN GRANULAR FORM A SURFACE AREA OF AT LEAST 0.20 SQUARE METER PER GRAM, AND CUTTING THE STRIP INTO GRANULES OF A SIZE SUITABLE AS FEED TO AN EXTRUDER.
Claim 2
Independent Claim
115 words
THE METHOD WHICH COMPRISES EXTRUDING A THIN HOT STRIP HAVING A DENSITY FROM 0.9 TO 1.1 OF A COMPOSITION CONSISTING ESSENTIALLY OF A MINOR PROPORTION, FROM 2 TO 20 PERCENT BY WEIGHT, OF A RUBBERY DIENE POLYMERIC MATERIAL AND A PREDOMINANT PROPORTION, CORRESPONDINGLY FROM 98 TO 80 PERCENT BY WEIGHT, OF A MONOALKENYL BENZENE SERIES HYDROCARBON POLYMER, COOLING THE THIN STRIP BELOW ITS SECOND ORDER TRANSITION TEMPERATURE, SUBJECTING THE SO-COOLED STRIP TO A DISTORTING FORCE SUFFICIENT TO CRAZE-CRACK THE SURFACE SO AS TO PROVIDE THEREON WHEN IN GRANULAR FORM A SURFACE AREA OF AT LEAST 0.20 SQUARE METER PER GRAM, AND CUTTING THE STRIP INTO GRANULES OF A SIZE SUITABLE AS FEED TO AN EXTRUDER.
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) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |