US3836595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene with supported pi-allyl chromium complexes
Assignee: Union Carbide Corp
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Filing: 1971-10-27
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Granted: 1974-09-17
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Expires: 1991-10-27
Abstract
Abstract *-ALLYL CHROMIUM COMPOUNDS, WHEN SUPPORTED ON AN INORGANIC OXIDE HAVING A HIGH SURFACE AREA AND WHILE IN THE CHROMIUM (II) VALENCE STATE, YIELD ETHYLENE POLYMERIZATION CATALYSTS HAVING AN UNUSUALLY HIGH LEVEL OF POLYMER PRODUCTIVITY.
Inventors
- 👤 R Johnson
- 👤 F Karol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:26
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/26; C07C2/32; C07C2/34; C08; C08F; C08F10/00; C07C2531/00; C07C2531/16; C07C2531/22; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/902
Claims Analysis
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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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |