Patent US2779074A successfully refreshed from Google Patents.
Patent US2935495A successfully refreshed from Google Patents.
US2935495A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyolefins
Assignee: Sunoco Inc
•
Filing: 1956-11-27
•
Granted: 1960-05-03
•
Expires: 1976-11-27
Abstract
No abstract record available.
Inventors
- 👤 Robert M Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:16
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/10; C; C08; C08F; C08F10/00; C08F110/00; C08F110/02; Y; Y10; Y10S; Y10S526/00; Y10S526/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
PROCESS FOR THE PREPARATION OF SOLID POLYMERS OF NORMALLY GASEOUS OLEFINS WHICH COMPRISES FORMING A BED OF SOLID CATALYST PARTICLES CONSISTING OF THE REACTION PRODUCT OF TITANIUM TRICHLORIDE AND AN ALUMINUM ALKYL ON THE INNER PERIPHERY OF A CENTRIFUGE BASKET FORMED OF POROUS MESH SCREEN HAVING OPENINGS SMALLER THAM THE DIAMETER OF SAID CATALYST PARTICLES WHEREBY TO RETAIN THE PARTICLES WITHIN THE BASKET, CONTACTING THE OUTER SURFACE OF SAID BED, UNDER POLYMERIZING CONDITIONS INCLUDING A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 170*C., AND A PRESSURE OF FROM ABOUT ATMOSPHERIC TO ABOUT 5,000 P.S.I.G., WITH A NORMALLY GASEOUS OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE AND PROPYLENE IN AN INERT LIQUID REACTION MEDIUM WHILE ROTATING SAID BASKET AT A SPEED SUFFICIENT TO ORIENT POLYMERS OF SAID OLEFIN OUTWARDLY THEREFROM, AND CLEAVING THE SO-FORMED POLYMERS FROM THE CATALYST BED.
Claim 2
Dependent Claim
139 words
PROCESS FOR THE PREPARATION OF SOLID POLYMERS OF NORMALLY GASEOUS OLEFINS WHICH COMPRISES FORMING A BED OF SOLID CATALYST PARTICLES CONSISTING OF THE REACTION PRODUCT OF TITANIUM TRICHLORIDE AND AN ALUMINUM ALKYL ON THE INNER PERIPHERY OF A CENTRIFUGE BASKET FORMED OF POROUS MESH SCREEN HAVING OPENINGS SMALLER THAM THE DIAMETER OF SAID CATALYST PARTICLES WHEREBY TO RETAIN THE PARTICLES WITHIN THE BASKET, CONTACTING THE OUTER SURFACE OF SAID BED, UNDER POLYMERIZING CONDITIONS INCLUDING A TEMPERATURE OF FROM ABOUT 0*C. TO ABOUT 170*C., AND A PRESSURE OF FROM ABOUT ATMOSPHERIC TO ABOUT 5,000 P.S.I.G., WITH A NORMALLY GASEOUS OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE AND PROPYLENE IN AN INERT LIQUID REACTION MEDIUM WHILE ROTATING SAID BASKET AT A SPEED SUFFICIENT TO ORIENT POLYMERS OF SAID OLEFIN OUTWARDLY THEREFROM, AND CLEAVING THE SO-FORMED POLYMERS FROM THE CATALYST BED.
References Cited (Backward Citations)
US2418797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |