US3579493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene using reduced groups iv-b,v-b and vi-b metal salts as the polymerization catalyst
Assignee: Individual
•
Filing: 1955-08-09
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Granted: 1971-05-18
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Expires: 1975-08-09
Abstract
Abstract THE POLYMERIZATION OF ETHYLENE UTLIZING A CATALYST FORMED BY REDUCING A HALIDE OR ACETYLACETONATE OF A METAL OF GROUPS IV-B, V-B AND VI-B OF THE PERIODIC CHART OF THE ELEMENTS, INCLUDING THORIUM AND URANIUM, WITH AN ALKALI METAL OR MAGNESIUM, OR A MIXTURE OR AN ALLOY THEREOF, OR SODIUM-, LITHIUM- OR CALCIUM HYDRIDE. THE REDUCTION AGENT MAY BE IN THE FORM OF A COMPLEX, AS FOR EXAMPLE A COMPLEX COMPOUND WITH AN ORGANO BORON COMPOUND. THE CATALYST MAY ALSO BE ADMIXES WITH TABLE SALT.
Inventors
- 👤 Karl Ziegler
- 👤 Heinz Breil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
C; C08; C08F; C08F10/00; F; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S526/00; Y10S526/906
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |