US3147242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polymerizing a mixture of cis- and trans-piperylenes
Assignee: Bridgestone Firestone Inc
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Filing: 1961-05-15
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Granted: 1964-09-01
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Expires: 1981-05-15
Abstract
No abstract record available.
Inventors
- 👤 Richard S Stearns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:15
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A TWO-STEP PROCESS OF UTILIZING A MIXTURE OF TRANSAND CIS-PIPERYLENES, REFERRED TO HEREIN AS THE FIRST AND SECOND MONOMERS, IN THE PRODUCTION OF POLYPIPERYLENE WITH THE SEPARATE USE OF AN AQUEOUS FREE-RADICAL CATALYST SYSTEM AND A LITHIUM-BASED CATALYST SYSTEM, WHICH PROCESS COMPRISES SUBJECTING THE MIXTURE TO POLYMERIZATION IN ONE OF SAID SYSTEMS IN WHICH A FIRST MONOMER IS POLYMERIZED AT LEAST TWICE AS RAPIDLY AS THE SECOND MONOMER TO SUCH EXTENT THAT THE MONOMER MIXTURE IS ENRICHED AS REGARDS THE SECOND MONOMER, SEPARATING UNREACTED MONOMER MIXTURE FROM THE POLYMER PRODUCT, AND THEN SUBJECTING SAID UNREACTED MONOMER TO POLYMERIZATION IN THE OTHER OF SAID SYSTEMS IN WHICH THE SECOND MONOMER IS POLYMERIZED AT LEAST TWICE AS RAPIDLY AS THE FIRST MONOMER.
Claim 2
Dependent Claim
120 words
A TWO-STEP PROCESS OF UTILIZING A MIXTURE OF TRANSAND CIS-PIPERYLENES, REFERRED TO HEREIN AS THE FIRST AND SECOND MONOMERS, IN THE PRODUCTION OF POLYPIPERYLENE WITH THE SEPARATE USE OF AN AQUEOUS FREE-RADICAL CATALYST SYSTEM AND A LITHIUM-BASED CATALYST SYSTEM, WHICH PROCESS COMPRISES SUBJECTING THE MIXTURE TO POLYMERIZATION IN ONE OF SAID SYSTEMS IN WHICH A FIRST MONOMER IS POLYMERIZED AT LEAST TWICE AS RAPIDLY AS THE SECOND MONOMER TO SUCH EXTENT THAT THE MONOMER MIXTURE IS ENRICHED AS REGARDS THE SECOND MONOMER, SEPARATING UNREACTED MONOMER MIXTURE FROM THE POLYMER PRODUCT, AND THEN SUBJECTING SAID UNREACTED MONOMER TO POLYMERIZATION IN THE OTHER OF SAID SYSTEMS IN WHICH THE SECOND MONOMER IS POLYMERIZED AT LEAST TWICE AS RAPIDLY AS THE FIRST 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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |