US2978443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ash removal from polymerization products
Assignee: Phillips Petroleum Co
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Filing: 1957-06-12
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Granted: 1961-04-04
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Expires: 1977-06-12
Abstract
No abstract record available.
Inventors
- 👤 Walter A Goldtrap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:48
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN THE PRODUCTION OF POLYMERS OF 1-OLEFINS BY CONTACTING THE OLEFINS, UNDER POLYMERIZING CONDITIONS, WITH A CATALYST COMPRISING CHROMIUM OXIDE, AT LEAST PART OF THE CHROMIUM BEING IN THE HEXAVALENT STATE, AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, ZIRCONIA AND THORIA, THE METHOD OF REMOVING CATALYST FROM THE POLYMERIZATION PRODUCT WHICH COMPRISES CONTACTING THE POLYMERIZATION PRODUCT WITH HYDROFLUORIC ACID SO AS TO DISSOLVE AT LEAST A PORTION OF SAID CATALYST AND SEPARATING THE POLYMER FROM THE RESULTING DISSOLVED CATALYST.
Claim 2
Dependent Claim
85 words
IN THE PRODUCTION OF POLYMERS OF 1-OLEFINS BY CONTACTING THE OLEFINS, UNDER POLYMERIZING CONDITIONS, WITH A CATALYST COMPRISING CHROMIUM OXIDE, AT LEAST PART OF THE CHROMIUM BEING IN THE HEXAVALENT STATE, AND AT LEAST ONE OXIDE SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, ZIRCONIA AND THORIA, THE METHOD OF REMOVING CATALYST FROM THE POLYMERIZATION PRODUCT WHICH COMPRISES CONTACTING THE POLYMERIZATION PRODUCT WITH HYDROFLUORIC ACID SO AS TO DISSOLVE AT LEAST A PORTION OF SAID CATALYST AND SEPARATING THE POLYMER FROM THE RESULTING DISSOLVED CATALYST.
References Cited (Backward Citations)
BE533362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-03 | 1964-10-03 | 1965-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-03 | 1968-10-03 | 1969-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-03 | 1972-10-03 | 1973-04-04 | $7700.00 | Window Closed / Lapsed |