Patent US1578952A successfully refreshed from Google Patents.
US2563631A
Expired / Lapsed
US
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Method of preparing liquid copolymers of ethylene and styrene
Assignee: Standard Oil Development Co
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Filing: 1947-10-09
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Granted: 1951-08-07
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Expires: 1967-10-09
Abstract
No abstract record available.
Inventors
- 👤 David W Young
- 👤 William H Smyers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:44
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE METHOD OF PREPARING A COPOLYMER OF ETHYLENE AND STYRENE WHICH COMPRISES PREPARING A MIXTURE OF THE COMPONENTS CONTAINING 1 TO 30% BY WEIGHT OF STYRENE AND PASSING SUCH MIXTURE IN GASEOUS FORM INTO AN ALKYL HALIDE SOLUTION CONSISTING ESSENTIAL OF 2 TO 20 GRAMS OF A FRIEDELCRAFTS CATALYST PER 100 ML. OF SOLUTION, AT A TEMPERATURE OF 0 TO 20* C. AND UNDER AN ABSOLUTE PRESSURE OF 2 TO 5 ATMOSPHERES.
Claim 2
Independent Claim
72 words
THE METHOD OF PREPARING A COPOLYMER OF ETHYLENE AND STYRENE WHICH COMPRISES PREPARING A MIXTURE OF THE COMPONENTS CONTAINING 1 TO 30% BY WEIGHT OF STYRENE AND PASSING SUCH MIXTURE IN GASEOUS FORM INTO AN ALKYL HALIDE SOLUTION CONSISTING ESSENTIAL OF 2 TO 20 GRAMS OF A FRIEDELCRAFTS CATALYST PER 100 ML. OF SOLUTION, AT A TEMPERATURE OF 0 TO 20* C. AND UNDER AN ABSOLUTE PRESSURE OF 2 TO 5 ATMOSPHERES.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |