Patent US2739141A successfully refreshed from Google Patents.
US2739141A
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Process for preparing highly unsaturated copolymers of isobutylene
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1951-03-31
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Granted: 1956-03-20
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Expires: 1971-03-31
Abstract
No abstract record available.
Inventors
- 👤 John L Ernst
- 👤 Robert M Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:01
CPC Classifications
C; C08; C08F; C08F10/00; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A LOW TEMPERATURE POLYMERIZATION PROCESS FOR MAKING SYNTHETIC RUBBER COMPRISING THE STEPS OF MIXING TOGETHER 100 PARTS BY WEIGHT OF ISOBUTYLENE AND FROM 25 TO 150 PARTS BY WEIGHT OF ISOPRENE HAVING A PURITY OF AT LEAST 99 MOLE PERCENT, COOLING THE MATERIAL TO A TEMPERATURE WITHIN THE RANGE BETWEEN 0* C. AND -164* C., AND THEREAFTER POLYMERIZING THE MIXTURE BY THE APPLICATION THERETO OF A SOLUTION OF ALUMINUM CHLORIDE IN METHYL CHLORIDE TO YIELD A RUBBERY COPOLYMER CHARACTERIZED BY A MOLECULAR WEIGHT BETWEEN 20,000 AND 100,000, AN 8MINUTE MOONEY VALUE ABOUT 50, AND AN IODINE NUMBER BETWEEN 55 AND 175.
Claim 2
Dependent Claim
101 words
A LOW TEMPERATURE POLYMERIZATION PROCESS FOR MAKING SYNTHETIC RUBBER COMPRISING THE STEPS OF MIXING TOGETHER 100 PARTS BY WEIGHT OF ISOBUTYLENE AND FROM 25 TO 150 PARTS BY WEIGHT OF ISOPRENE HAVING A PURITY OF AT LEAST 99 MOLE PERCENT, COOLING THE MATERIAL TO A TEMPERATURE WITHIN THE RANGE BETWEEN 0* C. AND -164* C., AND THEREAFTER POLYMERIZING THE MIXTURE BY THE APPLICATION THERETO OF A SOLUTION OF ALUMINUM CHLORIDE IN METHYL CHLORIDE TO YIELD A RUBBERY COPOLYMER CHARACTERIZED BY A MOLECULAR WEIGHT BETWEEN 20,000 AND 100,000, AN 8MINUTE MOONEY VALUE ABOUT 50, AND AN IODINE NUMBER BETWEEN 55 AND 175.
References Cited (Backward Citations)
US2305007A
Cited
US2332194A
Cited
US2356128A
Cited
US2559062A
Cited
US2587430A
Cited
US2607764A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |