US3254062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of rubbery polymers of conjugated dienes
Assignee: Bridgestone Firestone Inc
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Filing: 1961-04-14
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Granted: 1966-05-31
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Expires: 1981-04-14
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Forman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:54
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
THE METHOD OF PRODUCING A STERESPECIFIC RUBBERY POLYMER CONTAINING AT LEAST 85% 1,4-STRUCTURE WHICH COMPRISES POLYMERIZING A MONOMER SELECTED FROM THE GROUP CONSISTING OF ISOPRENE, BUTADIENE AND PIPERYLENE BY MEANS OF A CATALYST CONSISTING ESSENTIALLY OF AN ORGANOLITHIUM COMPOUND WHICH REACTS WITH WATR TO LIBERATE HYDROGEN AND IN THE PRESENCE OF A CARBONYL COMPOUND CONTAINING NOT MORE THAN ABOUT 10 CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC KETONES, ALDEHYDES AND ESTERS, SAID CARBONYL COMPOUND BEING PRESENT IN AN AMOUNT REQUISITE TO PROVIDE FROM ABOUT 0.1 TO ABOUT 0.9 MOL OF CARBONYL OXYGEN PER MOL OF CATALYST EMPLOYED, SAID POLYMRIZATION BEING EFFECTED IN THE ABSENCE OF OXYGEN OTHER THAN THAT PRESENT IN SAID CARBONYL COMPOUND, AND THE AMOUNT OF SAID CATALYST BEING SUFFICIENT TO PROVIDE FROM 0.00002 TO 0.05 GRAM OF ACTIVE LITHIUM ELEMENT PER 100 GRAMS OF SAID MONOMER.
Claim 2
Independent Claim
144 words
THE METHOD OF PRODUCING A STERESPECIFIC RUBBERY POLYMER CONTAINING AT LEAST 85% 1,4-STRUCTURE WHICH COMPRISES POLYMERIZING A MONOMER SELECTED FROM THE GROUP CONSISTING OF ISOPRENE, BUTADIENE AND PIPERYLENE BY MEANS OF A CATALYST CONSISTING ESSENTIALLY OF AN ORGANOLITHIUM COMPOUND WHICH REACTS WITH WATR TO LIBERATE HYDROGEN AND IN THE PRESENCE OF A CARBONYL COMPOUND CONTAINING NOT MORE THAN ABOUT 10 CARBON ATOMS AND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC AND AROMATIC KETONES, ALDEHYDES AND ESTERS, SAID CARBONYL COMPOUND BEING PRESENT IN AN AMOUNT REQUISITE TO PROVIDE FROM ABOUT 0.1 TO ABOUT 0.9 MOL OF CARBONYL OXYGEN PER MOL OF CATALYST EMPLOYED, SAID POLYMRIZATION BEING EFFECTED IN THE ABSENCE OF OXYGEN OTHER THAN THAT PRESENT IN SAID CARBONYL COMPOUND, AND THE AMOUNT OF SAID CATALYST BEING SUFFICIENT TO PROVIDE FROM 0.00002 TO 0.05 GRAM OF ACTIVE LITHIUM ELEMENT PER 100 GRAMS OF SAID MONOMER.
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) | 1969-05-30 | 1969-11-29 | 1970-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-30 | 1973-11-29 | 1974-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-30 | 1977-11-29 | 1978-05-31 | $7700.00 | Window Closed / Lapsed |