US3658770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unsaturated partially crystalline terpolymers of ethylene propylene and hydrocarbon dienes or polyenes and process for preparing said terpolymers
Assignee: Montedison SpA
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Filing: 1968-12-13
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Granted: 1972-04-25
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Expires: 1988-12-13
Abstract
Abstract THERE ARE DISCLOSED UNSATURATED TERPOLYMERS OF ETHYLENE, PROPYLENE, AND HYDROCARBON MONOMERS CONTAINING AT LEAST TWO DOUBLE BONDS, WHICH TERPOLYMERS EXHIBIT FROM 20% TO 75% CRYSTALLINITY BUT ARE VULCANIZABLE TO ELASTOMERIC MATERIALS. THE TERPOLYMERS ARE OBTAINED BY POLYMERIZING A MIXTURE OF ETHYLENE, PROPYLENE AND AT LEAST ONE OF THE HYDROCARBON MONOMERS CONTAINING AT LEAST TWO DOUBLE BONDS IN CONTACT WITH A CATALYST PREPARED FROM TITANIUM OR VANADIUM COMPOUNDS AND AN ORGANOMETALLIC ALUMINUM COMPOUND.
Inventors
- 👤 Paolo Longi
- 👤 Francesco Greco
- 👤 Ermanno Bernasconi
- 👤 Alberto Valvassori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:31
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08F210/18
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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |