US3150122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of high-density ziegler polymers
Assignee: Monsanto Co
•
Filing: 1957-11-07
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Granted: 1964-09-22
•
Expires: 1977-11-07
Abstract
No abstract record available.
Inventors
- 👤 Harry M Andersen
- 👤 Jr William R Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:47
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
THE METHOD OF PREPARING HIGH-DENSITY POLYETHYLENE WHICH COMPRISES POLYMERIZING ETHYLENE IN THE PRESENCE OF A CATALYST PREPARED BY REACTING (AL(ISOBUTYL)3 WITH TICL4 IN A MOLE RATIO OF 0.3:1 TO 0.8:1 IN AN INERT ORGANIC LIQUID, AND ADDING PHENOL IN AN AMOUNT TO PROVIDE A PHENOL TO AL MOLAR RATIO OF ABOUT 1, THE PHENOL BEING ADDED WITHIN 10 MINUTES OF THE START OF POLYMERIZATION, THE CONCENTRATION OF THE CATALYST BEING ABOUT 10 TO 40 MILLIMOLES, CALCULATED AS TI, PER LITER OF ORGANIC LIQUID, AND CONTINUING THE POLYMERIZATION FOR A TIME SUFFICIENT TO PRODUCE POLYETHYLENE HAVING AN IZOD IMPACT STRENGTH OF AT LEAST 1 FT.-LB.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |