Patent US3008945A successfully refreshed from Google Patents.
US3008945A
Expired / Lapsed
US
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Methods of preparing 1, 4 trans polyisoprene
Assignee: Goodyear Tire and Rubber Co
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Filing: 1958-04-28
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Granted: 1961-11-14
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Expires: 1978-04-28
Abstract
No abstract record available.
Inventors
- 👤 William M Saltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:03
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/08; C08F2410/00; C08F2410/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
THE METHOD OF PREPARING POLYISOPRENE HAVING A POLYMER STRUCTURE OF 1,4 ADDITION AND TRANS CONFIGURATION WHICH COMPRISES POLYMERIZING ISOPRENE IN THE PRESENCE OF A CATALYST COMPRISING AN ALUMINUM ALKYL, TITANIUM TETRACHLORIDE AND FERRIC CHLORIDE IN WHICH THE MOLAR RATIO OF ALUMINUM ALKYL/TITANIUM TETRACHLORIDE/FERRIC CHLORIDE IS 10/1/1-7.
Claim 2
Independent Claim
46 words
THE METHOD OF PREPARING POLYISOPRENE HAVING A POLYMER STRUCTURE OF 1,4 ADDITION AND TRANS CONFIGURATION WHICH COMPRISES POLYMERIZING ISOPRENE IN THE PRESENCE OF A CATALYST COMPRISING AN ALUMINUM ALKYL, TITANIUM TETRACHLORIDE AND FERRIC CHLORIDE IN WHICH THE MOLAR RATIO OF ALUMINUM ALKYL/TITANIUM TETRACHLORIDE/FERRIC CHLORIDE IS 10/1/1-7.
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) | 1964-11-13 | 1965-05-15 | 1965-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-11-13 | 1969-05-15 | 1969-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-11-13 | 1973-05-15 | 1973-11-14 | $7700.00 | Window Closed / Lapsed |