US2874153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of propylene
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1955-10-28
•
Granted: 1959-02-17
•
Expires: 1975-10-28
Abstract
No abstract record available.
Inventors
- 👤 Lewis W Bowman
- 👤 Robert F Leary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:38
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD FOR PREPARING POLYPROPYLENE WHICH COMPRISES POLYMERIZING PROPYLENE WHICH IS ESSENTIALLY FREE OF CATALYST POISONS AT A TEMPERATURE OF ABOUT 50* TO 100* C. AND AT ABOUT ATMOSPHERIC PRESSURE IN THE PRESENCE OF A CATA LYST OBTAINED BY MIXING ALUMINUM TRIETHYL WITH TITANIUM TETRACHLORIDE, THE MOL RATIO OF ALUMINUM TO TITANIUM IN THE CATALYST BEING IN THE RANGE OF ABOUT 1.75:1 TO 2.25:1, SAID POLYMERIZATION BEING CARRIED OUT IN THE PRESENCE OF AN ESSENTIALLY INERT LIQUID DILUENT.
Claim 2
Independent Claim
78 words
A METHOD FOR PREPARING POLYPROPYLENE WHICH COMPRISES POLYMERIZING PROPYLENE WHICH IS ESSENTIALLY FREE OF CATALYST POISONS AT A TEMPERATURE OF ABOUT 50* TO 100* C. AND AT ABOUT ATMOSPHERIC PRESSURE IN THE PRESENCE OF A CATA LYST OBTAINED BY MIXING ALUMINUM TRIETHYL WITH TITANIUM TETRACHLORIDE, THE MOL RATIO OF ALUMINUM TO TITANIUM IN THE CATALYST BEING IN THE RANGE OF ABOUT 1.75:1 TO 2.25:1, SAID POLYMERIZATION BEING CARRIED OUT IN THE PRESENCE OF AN ESSENTIALLY INERT LIQUID DILUENT.
References Cited (Backward Citations)
BE533362A
Cited
US2721189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |