US3592880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyolefins
Assignee: Hoechst AG
•
Filing: 1967-12-27
•
Granted: 1971-07-13
•
Expires: 1987-12-27
Abstract
Abstract POLYETHYLENE OR COPOLYMERS OF ETHYLENE AND HIGHER AOLEFINS HAVING A HIGH STRESS CRACKING RESISTANCE, ARE PREPARED BY A PROCESS WHICH COMPRISES TWO REACTION STEPS OF A SUSPENSION OR GASEOUS PHASE POLYMERIZATION, IN WHICH A MIXED CATALYST OF A TRIVALENT CHLORINE-CONTAINING TITANIUM COMPOUND AND AN ALUMINIUM TRIALKYL OR A REACTION PRODUCT OF ALUMINIUM TRIALKYLS OR ALKYHYDRIDES WITH DIOLEFINS IS USED, THE HYDROGEN CONTENT OF THE GAS ZONE BEING LOW IN ONE STEP AND HIGH IN THE OTHER STEP.
Inventors
- 👤 Bernd Diedrich
- 👤 Karl Diether Kreil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:16
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |