US3798288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene/propylene block copolymers
Assignee: Monsanto Co
•
Filing: 1959-06-11
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Granted: 1974-03-19
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Expires: 1979-06-11
Abstract
Abstract A METHOD OF PREPARING BLOCK COPOLYMERS FROM ETHYLENE AND PROPYLENE MONOMERS WHICH COMPRISES ALTERNATELY POLYMERIZING ONE OF SAID MONOMERS AND A MIXTURE OF SAID MONOMERS IN THE PRESENCE OF A CATALYST COMPRISING A VANADIUM HALIDE AND AN ALUMINUM ALKYL COMPOUND.
Inventors
- 👤 R Mcmanimie
- 👤 W Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:55
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; C08F297/083
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |