US2671774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High extrusion modified isoolefinmultiolefin copolymers
Assignee: Standard Oil Development Co
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Filing: 1952-07-28
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Granted: 1954-03-09
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Expires: 1972-07-28
Abstract
No abstract record available.
Inventors
- 👤 Edward A Mccracken
- 👤 Allen L Chaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:16
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN THE PROCESS OF MAKING VULCANIZABLE RUBBERY POLYMERS OF INCREASED TOUGHNESS AND GOOD EXTRUSION PROPERTIES, COMPOSED OF A MAJOR PROPORTION OF AN ISOOLEFIN HAVING 4 TO 5 CARBON ATOMS, A MINOR PROPORTION OF A CONJUGATED DIOLEFIN OF 4 TO 8 CARBON ATOMS, AND A MINOR PROPORTION OF A DIVINYL AROMATIC HYDROCARBON, BY POLYMERIZATION AT A TEMPERATURE BELOW -40* C. WITH A FRIEDEL-CRAFTS CATALYST DISSOLVED IN A SOLVENT WHICH DOES NOT FORM A COMPLEX THEREWITH AND WHICH IS LIQUID AT THE POLYMERIZATION TEMPERA-
Claim 2
Dependent Claim
82 words
IN THE PROCESS OF MAKING VULCANIZABLE RUBBERY POLYMERS OF INCREASED TOUGHNESS AND GOOD EXTRUSION PROPERTIES, COMPOSED OF A MAJOR PROPORTION OF AN ISOOLEFIN HAVING 4 TO 5 CARBON ATOMS, A MINOR PROPORTION OF A CONJUGATED DIOLEFIN OF 4 TO 8 CARBON ATOMS, AND A MINOR PROPORTION OF A DIVINYL AROMATIC HYDROCARBON, BY POLYMERIZATION AT A TEMPERATURE BELOW -40* C. WITH A FRIEDEL-CRAFTS CATALYST DISSOLVED IN A SOLVENT WHICH DOES NOT FORM A COMPLEX THEREWITH AND WHICH IS LIQUID AT THE POLYMERIZATION TEMPERA-
References Cited (Backward Citations)
US2474807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |