US3205211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of conjugated diolefins
Assignee: Bridgestone Firestone Inc
•
Filing: 1960-09-29
•
Granted: 1965-09-07
•
Expires: 1980-09-29
Abstract
No abstract record available.
Inventors
- 👤 Richard W Kibler
- 👤 Thomas B Talcott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:46
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR PREPARING A LITHIUM MODIFIED CARBON BLACK CATALYST EFFECTIVE TO POLYMERIZE A CONJUGATED DIOLEFIN TO A RUBBERY POLYMER HAVING ESSENTIALLY 1,4-STRUCTURE WHICH COMPRISES PASSING CHLORINE OVER A CARBON BLACK AT ELEVATED TEMPERATURES TO PRODUCE A CHLORINATED CARBON BLACK, AND REACTING FINELY DIVIDED LITHIUM METAL WITH THE CHLORINATED CARBON BLACK UNTIL A LITHIUM MODIFIED CARBON BLACK IS ATTAINED CONTAINING FROM ABOUT 0.15 TO ABOUT 4% BY WEIGHT OF LITHIUM CHEMICALLY BOUND TO CARBON.
Claim 2
Dependent Claim
74 words
A PROCESS FOR PREPARING A LITHIUM MODIFIED CARBON BLACK CATALYST EFFECTIVE TO POLYMERIZE A CONJUGATED DIOLEFIN TO A RUBBERY POLYMER HAVING ESSENTIALLY 1,4-STRUCTURE WHICH COMPRISES PASSING CHLORINE OVER A CARBON BLACK AT ELEVATED TEMPERATURES TO PRODUCE A CHLORINATED CARBON BLACK, AND REACTING FINELY DIVIDED LITHIUM METAL WITH THE CHLORINATED CARBON BLACK UNTIL A LITHIUM MODIFIED CARBON BLACK IS ATTAINED CONTAINING FROM ABOUT 0.15 TO ABOUT 4% BY WEIGHT OF LITHIUM CHEMICALLY BOUND TO CARBON.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |