Patent US3065218A successfully refreshed from Google Patents.
US3065218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of isoprene in aliphatic monoolefin solvent
Assignee: Shell USA Inc
•
Filing: 1959-02-05
•
Granted: 1962-11-20
•
Expires: 1979-02-05
Abstract
No abstract record available.
Inventors
- 👤 Charles R Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:07
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN A PROCESS FOR POLYMERIZING ISOPRENE IN THE PRESENCE OF AN ALKYL LITHIUM CATALYST CONTAINING FROM 2 TO 12 CARBON ATOMS AT A TEMPERATURE RANGING FROM -20*C. TO ABOUT 100*C. TO FORM A NORMALLY SOLID HOMOPOLYMER OF ISOPRENE HAVING A HIGH CIS-1,4-CONTENT, THE IMPROVEMENT WHICH COMPRISES USING IN THE POLYMERIZATION AS SOURCE OF ISOPRENE AN ISOPRENE FEED CONTAINING IN EXCESS OF 50% BY WEIGHT OF ALIPHATIC MONOOLEFIN CONTAINING FIVE CARBON ATOMS PER MOLECULE.
Claim 2
Dependent Claim
73 words
IN A PROCESS FOR POLYMERIZING ISOPRENE IN THE PRESENCE OF AN ALKYL LITHIUM CATALYST CONTAINING FROM 2 TO 12 CARBON ATOMS AT A TEMPERATURE RANGING FROM -20*C. TO ABOUT 100*C. TO FORM A NORMALLY SOLID HOMOPOLYMER OF ISOPRENE HAVING A HIGH CIS-1,4-CONTENT, THE IMPROVEMENT WHICH COMPRISES USING IN THE POLYMERIZATION AS SOURCE OF ISOPRENE AN ISOPRENE FEED CONTAINING IN EXCESS OF 50% BY WEIGHT OF ALIPHATIC MONOOLEFIN CONTAINING FIVE CARBON ATOMS PER MOLECULE.
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) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |