US2604465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective copolymerization of isobutylene from a c4 mixture
Assignee: Standard Oil Development Co
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Filing: 1950-05-20
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Granted: 1952-07-22
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Expires: 1970-05-20
Abstract
No abstract record available.
Inventors
- 👤 Helmuth G Schneider
- 👤 David W Young
- 👤 Hans G Goering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:30
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
THE PROCESS WHICH COMPRISES SUBJECTING A MIXTURE OF STYRENE, ISOBUTYLENE, BUTENE-1, CIS BUTENE-2, TRANS BUTENE-2, AND BUTADIENE, THE AMOUNT OF BUTADIENE BEING NOT MORE THAN 0.4% OF THE MATERIALS OTHER THAN STYRENE, TO TEMPERATURES NOT ABOVE +10* C. IN THE PRESENCE OF AN AMOUNT OF ALUMINUM CHLORIDE ONLY SLIGHTLY IN EXCESS OF THAT REQUIRED TO INITIATE THE REACTION WHEREBY THE ISOBUTYLENE IS COPOLYMERIZED WTIH THE STYRENE TO THE SUBSTANTIAL EXCLUSION OF THE BUTENE-1, BUTENE-2, AND BUTADIENE.
References Cited (Backward Citations)
US2438340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |