US2981726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing propylene with a catalyst of aluminum trialkyl, titanium tetrachloride and metallic iron
Assignee: Standard Oil Co
•
Filing: 1958-04-02
•
Granted: 1961-04-25
•
Expires: 1978-04-02
Abstract
No abstract record available.
Inventors
- 👤 Leon B Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:06
CPC Classifications
C; C08; C08F; C08F10/00; C08F2410/00; C08F2410/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
IN A PROCESS FOR THE POLYMERIZATION OF PROPYLENE, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID PROPYLENE UNDER POLYMERIZATION CONDITIONS WITH A CATALYST CONSISTING ESSENTIALLY OF FINELY DIVIDED IRON PARTICLES, TRIALKYLALUMINUM, AND TITANIUM TETRACHLORIDE.
Claim 2
Dependent Claim
32 words
IN A PROCESS FOR THE POLYMERIZATION OF PROPYLENE, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID PROPYLENE UNDER POLYMERIZATION CONDITIONS WITH A CATALYST CONSISTING ESSENTIALLY OF FINELY DIVIDED IRON PARTICLES, TRIALKYLALUMINUM, AND TITANIUM TETRACHLORIDE.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |