US3711455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of copolymers of a monoolefin and a diolefin and the products obtained thereby
Assignee: SnamProgetti SpA
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Filing: 1970-09-24
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Granted: 1973-01-16
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Expires: 1990-09-24
Abstract
Abstract A HIGH MOLECULAR WEIGHT COPOLYMER WHICH EXHIBITS CRYSTALLINITY AND IS CROSSLINKABLE BY CURING IS PRODUCED BY REACTING A MONOOLEFIN AND A DIOLEFIN IN THE PRESENCE OF A CATALYST SYSTEM CONSISTING OF (A) A VANADIUM COMPOUND OF THE TYPE V(NR2)4 OR V(NR2)2X2 WHEREIN R MAY BE AN ALKYL, ARYL OR CYCLOALKYL RADICAL AND X MAY BE A HALOGEN, AND (B) AN ALUMINUM COMPOUND OF THE TYPE ALRXX3-X WHEREIN R MAY BE AN ALKYL, ARYL OR CYCLOALKYL RADICAL OR HDROGEN AND X MAY BE A HALOGEN, WHEREIN 1$X$2.
Inventors
- 👤 S Cucinella
- 👤 A Mazzei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:06
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |