US3579492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing long chain alkyl compounds
Assignee: Foote Mineral Co
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Filing: 1968-04-18
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Granted: 1971-05-18
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Expires: 1988-04-18
Abstract
Abstract ETHYLENE IS POLYMERIZED IN A SOLUTION OF AN N-BUTYLLITHIUM: N,N,N'',N''-TETRAMETHYLETHYLENE DIAMINE COMPLEX UNDER TEMPERATURE AND PRESSURE CONDITIONS SELECTED FROM A NARROW RANGE OF EACH UNTIL SUBSTANTIALLY ALL OF THE RESULTING POLYMER HAS PRECIPITATED FOR THE SOLUTION AS A LONG CHAIN N-ALKYLLITHIUM COMPOUND WHICH MAY BE CONVERTED TO THE CORRESPONDING POLYETHYLENE HAVING A MOLECULAR WEIGHT FROM ABOUT 1500 TO ABOUT 4000 WITH A MW/MN RATIO OF ABOUT 1.
Inventors
- 👤 William Novis Smith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:03
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/93; Y10S585/931; Y10S585/935
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 |