Patent US2967206A successfully refreshed from Google Patents.
US2967206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing polypropylene with a sub chloride of zirconium or titanium activated by mono alkyl aluminum dihalide
Assignee: Sunoco Inc
•
Filing: 1957-10-28
•
Granted: 1961-01-03
•
Expires: 1977-10-28
Abstract
No abstract record available.
Inventors
- 👤 Archibald P Stuart
- 👤 Habet M Khelghatian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:58
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A PROCESS FOR PREPARING NORMALLY LIQUID POLYMERS OF PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE, UNDER POLYMERIZING CONDITIONS, WITH A CATALYST CONSISTING OF A SUBCHLORIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND ZIRCONIUM IN COMBINATION WITH AN ACTIVATOR THEREFOR, WHICH IS A MONOALKYL ALUMINUM DICHLORIDE, WHEREIN THE ALKYL GROUP HAS FROM 1-TO 4 CARBON ATOMS.
Claim 2
Dependent Claim
57 words
A PROCESS FOR PREPARING NORMALLY LIQUID POLYMERS OF PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE, UNDER POLYMERIZING CONDITIONS, WITH A CATALYST CONSISTING OF A SUBCHLORIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM AND ZIRCONIUM IN COMBINATION WITH AN ACTIVATOR THEREFOR, WHICH IS A MONOALKYL ALUMINUM DICHLORIDE, WHEREIN THE ALKYL GROUP HAS FROM 1-TO 4 CARBON ATOMS.
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) | 1964-01-03 | 1964-07-04 | 1965-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-03 | 1968-07-04 | 1969-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-03 | 1972-07-04 | 1973-01-03 | $7700.00 | Window Closed / Lapsed |