Patent US2371991A successfully refreshed from Google Patents.
US3091606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organolithium polymerization initiator prepared in the presence of a small amount of sodium
Assignee: Phillips Petroleum Co
•
Filing: 1960-11-21
•
Granted: 1963-05-28
•
Expires: 1980-11-21
Abstract
No abstract record available.
Inventors
- 👤 Henry L Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:51
CPC Classifications
C; C08; C08F; C08F2/00; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
53 words
A PROCESS FOR PREPARING A POLYMERIZATION INITIATOR COMPOSITION WHICH COMPRISES CONTACTING LITHIUM WITH A MONOMER SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIENES AND VINYLIDENE-SUBSTITUTED AROMATIC COMPOUNDS IN A MEDIUM OF ALIPHATIC MONOETHER IN THE RESENCE OF SOLDIUM IN AN AMOUNT RANGING FROM ABOUT 0.25 TO ABOUT 5 WEIGHT PERCENT BASED ON LITHIUM.
Claim 2
Dependent Claim
53 words
A PROCESS FOR PREPARING A POLYMERIZATION INITIATOR COMPOSITION WHICH COMPRISES CONTACTING LITHIUM WITH A MONOMER SELECTED FROM THE GROUP CONSISTING OF CONJUGATED DIENES AND VINYLIDENE-SUBSTITUTED AROMATIC COMPOUNDS IN A MEDIUM OF ALIPHATIC MONOETHER IN THE RESENCE OF SOLDIUM IN AN AMOUNT RANGING FROM ABOUT 0.25 TO ABOUT 5 WEIGHT PERCENT BASED ON LITHIUM.
Claim 3
Dependent Claim
47 words
A PROCESS FOR PREPARING A POLYMER OF A CONJUGATED DIENE WHICH COMPRISES CONTACTING A CONJUGATED DIENE HAVING 4 TO 12 CARBON ATOMS PER MOLECULE IN A PREDOMINANTLY HYDROCARBON MEDIUM WITH AN INITIATOR COMPOSITION PREPARED ACCORDING TO PROCESS OF CLAIM 1, AND RECOVERING THE RESULTING CONJUGATED DIENE POLYMER.
References Cited (Backward Citations)
US1073116A
Cited
US2048169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |