US2928818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of polymerizing ethylene with aluminum-titanium halide catalyst
Assignee: Eastman Kodak Co
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Filing: 1957-07-01
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Granted: 1960-03-15
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Expires: 1977-07-01
Abstract
No abstract record available.
Inventors
- 👤 William D Carter
- 👤 Jr Newton H Shearer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:21
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE PROCESS FOR PRODUCING HIGH MOLECULAR WEIGHT CRYSTALLINE POLYETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A CATALYST INITIALLY CONTAINING AS ESSENTIAL COMPONENTS ALUMINUUM METAL AND FROM 1 TO 6 MOLAR EQUIVALENTS OF TITANIUM TETRACHLORIDE PER GRAM ATOM OF ALUMINIUM IN THE PRESENCE OF NOT MORE THAN ABOUT ONE-HALF THE TOTAL AMOUNT OF HEPTANE TO BE USED IN THE PROCESS AT A TEMPERATURE WITHIN THE RANGE OF 20 TO 200*C. AND A PRESSURE WITHIN THE RANGE OF 10-1000 P.S.I.G., AND AFTER ETHYLENE POLYMERIZATION HAS BEEN INITIATED ADDING ADDITIONAL HEPTANE TO THE REACTION MIXTURE, THE CONCENTRATION OF CATALYST IN THE TOTAL AMOUNT OF HEPTANE BEING WITHIN THE RANGE OF 0.1 TO 5% BY WEIGHT.
Claim 2
Dependent Claim
111 words
THE PROCESS FOR PRODUCING HIGH MOLECULAR WEIGHT CRYSTALLINE POLYETHYLENE WHICH COMPRISES CONTACTING ETHYLENE WITH A CATALYST INITIALLY CONTAINING AS ESSENTIAL COMPONENTS ALUMINUUM METAL AND FROM 1 TO 6 MOLAR EQUIVALENTS OF TITANIUM TETRACHLORIDE PER GRAM ATOM OF ALUMINIUM IN THE PRESENCE OF NOT MORE THAN ABOUT ONE-HALF THE TOTAL AMOUNT OF HEPTANE TO BE USED IN THE PROCESS AT A TEMPERATURE WITHIN THE RANGE OF 20 TO 200*C. AND A PRESSURE WITHIN THE RANGE OF 10-1000 P.S.I.G., AND AFTER ETHYLENE POLYMERIZATION HAS BEEN INITIATED ADDING ADDITIONAL HEPTANE TO THE REACTION MIXTURE, THE CONCENTRATION OF CATALYST IN THE TOTAL AMOUNT OF HEPTANE BEING WITHIN THE RANGE OF 0.1 TO 5% BY WEIGHT.
References Cited (Backward Citations)
US2825721A
Cited
FR1132506A
Cited
GB770507A
Cited
FR1147868A
Cited
FR1149945A
Cited
US2845414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-15 | 1963-09-14 | 1964-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-15 | 1967-09-14 | 1968-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-15 | 1971-09-14 | 1972-03-15 | $7700.00 | Window Closed / Lapsed |