US3288767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of shear response of polyolefins
Assignee: Phillips Petroleum Co
•
Filing: 1962-08-20
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Granted: 1966-11-29
•
Expires: 1982-08-20
Abstract
No abstract record available.
Inventors
- 👤 Hogan John Paul
- 👤 Alonzo G Kitchen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:31
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A PROCESS FOR OBTAINING A POLYMER HAVING A CONSTANT SHEAR RESPONSE WHICH COMPRISES FORMING A POLYMER OF A 1-OLEFIN BY POLYMERIZING AT LEAST ONE 1-OLEFIN MONOMER IN A POLYMERIZATION ZONE UNDER POLYMERIZATION CONDITIONS IN THE PRESENCE OF A PREVIOUSLY ACTIVATED CATALYST CONSISTING OF CHROMIUM OXIDE HAVING AT LEAST A PORTION THEREOF IN THE HEXAVALENT STATE AT THE TIME OF INITIAL CONTACTING, SAID ACTIVATED CATALYST HAVING BEEN PREPARED BY TREATING SAME WITH AN ACTIVATING FLUID CONTAINING FROM 0.01 TO 6.0 VOL. PERCENT MOISTURE THEREIN AT A TEMPERATURE OF 750 TO 2000*F., AND THEREAFTER CONTINUALLY ADDED TO SAID POLYMERIZATION ZONE, MEASURING THE SHAEAR RESPONSE OF SAID POLYMER TO OBTAIN A VALUE REPRESENTATIVE THEREOF AND ADJUSTING RESPONSIVE TO SAID VALUE THE MOSITURE CONTENT OF SAID ACTIVATING FLUID WHEREBY THE MOISTURE CONTENT IS INCREASED RESPONSIVE TO A DECREASE IN THE MEASURED SHEAR RESPONSE AND CONVERSELY THE MOISTURE CONTENT IS DECREASED RESPONSIVE TO INCREASE IN THEM MEASURED SHEAR RESPONSE.
Claim 2
Dependent Claim
154 words
A PROCESS FOR OBTAINING A POLYMER HAVING A CONSTANT SHEAR RESPONSE WHICH COMPRISES FORMING A POLYMER OF A 1-OLEFIN BY POLYMERIZING AT LEAST ONE 1-OLEFIN MONOMER IN A POLYMERIZATION ZONE UNDER POLYMERIZATION CONDITIONS IN THE PRESENCE OF A PREVIOUSLY ACTIVATED CATALYST CONSISTING OF CHROMIUM OXIDE HAVING AT LEAST A PORTION THEREOF IN THE HEXAVALENT STATE AT THE TIME OF INITIAL CONTACTING, SAID ACTIVATED CATALYST HAVING BEEN PREPARED BY TREATING SAME WITH AN ACTIVATING FLUID CONTAINING FROM 0.01 TO 6.0 VOL. PERCENT MOISTURE THEREIN AT A TEMPERATURE OF 750 TO 2000*F., AND THEREAFTER CONTINUALLY ADDED TO SAID POLYMERIZATION ZONE, MEASURING THE SHAEAR RESPONSE OF SAID POLYMER TO OBTAIN A VALUE REPRESENTATIVE THEREOF AND ADJUSTING RESPONSIVE TO SAID VALUE THE MOSITURE CONTENT OF SAID ACTIVATING FLUID WHEREBY THE MOISTURE CONTENT IS INCREASED RESPONSIVE TO A DECREASE IN THE MEASURED SHEAR RESPONSE AND CONVERSELY THE MOISTURE CONTENT IS DECREASED RESPONSIVE TO INCREASE IN THEM MEASURED SHEAR RESPONSE.
References Cited (Backward Citations)
US2825721A
Cited
US2984658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |