US3207742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of 1, 3-dienes in the presence of hexamethylphosphoramide
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1962-03-26
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Granted: 1965-09-21
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Expires: 1982-03-26
Abstract
No abstract record available.
Inventors
- 👤 Castle John F Van De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:27
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN A PROCESS OF POLYMERIZING A 1,3-DIENE TO A POLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE OF 5,000 TO 200,000 IN THE PRESENCE OF A LITHIUM HYDROCARBON CATALYST AND A HYDROCARBON DILUENT, THE IMPROVED METHOD OF INCREASING THE AMOUNT OF 1,2 STRUCTURE IN THE POLYMER TO ABOUT 50 75%, WHICH METHOD COMPRISES CARRYING OUT THE POLYMERIZATION IN THE ADDITIONAL PRESENCE OF HEXAMETHYLPHOSPHORAMIDE IN AN AMOUNT OF FROM 10 TO .01 MOL PERCENT BASED ON THE DIENE.
Claim 2
Dependent Claim
77 words
IN A PROCESS OF POLYMERIZING A 1,3-DIENE TO A POLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE OF 5,000 TO 200,000 IN THE PRESENCE OF A LITHIUM HYDROCARBON CATALYST AND A HYDROCARBON DILUENT, THE IMPROVED METHOD OF INCREASING THE AMOUNT OF 1,2 STRUCTURE IN THE POLYMER TO ABOUT 50 75%, WHICH METHOD COMPRISES CARRYING OUT THE POLYMERIZATION IN THE ADDITIONAL PRESENCE OF HEXAMETHYLPHOSPHORAMIDE IN AN AMOUNT OF FROM 10 TO .01 MOL PERCENT BASED ON THE DIENE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |