Patent US2500780A successfully refreshed from Google Patents.
US2500780A
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Stabilization of low unsaturation isoolefinic copolymers
Assignee: Standard Oil Development Co
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Filing: 1948-12-29
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Granted: 1950-03-14
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Expires: 1968-12-29
Abstract
No abstract record available.
Inventors
- 👤 Carll F Van Gilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:07
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF COPOLYMERIZING ISOBUTYLENE AND A MULTI-OLEFIN HAVING 4 TO 10 CARBON ATOMS PER MOLECULE COMPRISING THE STEP IN COMBINATION OF MIXING TOGETHER A MAJOR PROPORTION OF ISOBUTYLENE, A MINOR PROPORTION OF THE MULTI-OLEFIN AND FROM 0.1% TO 5% OF A 2,4,6-TRIALKYLATED PHENOL AND THEREAFTER POLYMERIZING THE MIXTURE AT A TEMPERATURE BETWEEN 0*C. AND -164*C. BY THE APPLICATION THERETO A FRIEDEL-CRAFTS CATALYST DISSOLVED IN A NON-COMPLES-FORMING SOLVENT WHICH IS LIQUID AT THE REACTION TEMPERATURE.
Claim 2
Independent Claim
75 words
THE METHOD OF COPOLYMERIZING ISOBUTYLENE AND A MULTI-OLEFIN HAVING 4 TO 10 CARBON ATOMS PER MOLECULE COMPRISING THE STEP IN COMBINATION OF MIXING TOGETHER A MAJOR PROPORTION OF ISOBUTYLENE, A MINOR PROPORTION OF THE MULTI-OLEFIN AND FROM 0.1% TO 5% OF A 2,4,6-TRIALKYLATED PHENOL AND THEREAFTER POLYMERIZING THE MIXTURE AT A TEMPERATURE BETWEEN 0*C. AND -164*C. BY THE APPLICATION THERETO A FRIEDEL-CRAFTS CATALYST DISSOLVED IN A NON-COMPLES-FORMING SOLVENT WHICH IS LIQUID AT THE REACTION TEMPERATURE.
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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |