Patent US1836217A successfully refreshed from Google Patents.
Patent US3172882A successfully refreshed from Google Patents.
US3172882A
Expired / Lapsed
US
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Polymerization catalyst comprising a crfj impregnates support anx process of polymerizing olefins therewith
Assignee: —
•
Filing: —
•
Granted: 1965-03-09
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Expires: 1982-03-09
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:38
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
92 words
A POLYMERIZATION PROCESS WHICH COMPRISES POLYMERIZING MONOMERS SELECTED FROM ETHYLENE AND MIXTURES OF ETHYLENE WITH HIGHER MOLECULAR WEIGHT OLEFINS UNDER POLYMERIZATION CONDITIONS OF TEMPERATURE AND PRESSURE IN THE PRESENCE OF A CATALYST COMPRISING CHROMIUM OXIDE SUPPORTED ON SILICA-ALUMINA AND WHEREIN AT LEAST A PORTION OF THE CHROMIUM IS HEXAVALENT, SAID CATALYST HAVING BEEN PREPARED BY DEPOSITING CHROMIUM FLUORIDE ON SILICAALUMINA AND HEATING AT AN ELEVATED TEMPERATURE FOR A PERIOD OF TIME SUFFICIENT TO ACTIVATE SAID CATALYST FOR SAID POLYMERIZATION AND LEAVE AT LEAST A PART OF THE CHROMIUM IN THE HEXAVALENT STATE.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |