US3772255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring-opening polymerization of cycloolefins
Assignee: Goodyear Tire and Rubber Co
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Filing: 1972-06-07
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Granted: 1973-11-13
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Expires: 1992-06-07
Abstract
Abstract THERE IS DISCLOSED A METHOD FOR THE RING-OPENING POLYMERIZATION OF CYCLOOLEFINS WHICH USES AS A CATALYST A MIXTURE OF TUNGSTEN OXIDE AND EITHER ALUMINUM CHLORIDE OR ALKYL ALUMINUM DICHLORIDE, WHEREIN THE ALKYL RADICALS CONTAIN FROM 1 TO 10 CARBON ATOMS.
Inventors
- 👤 A Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:56
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |