US2987487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst activation
Assignee: Phillips Petroleum Co
•
Filing: 1955-10-14
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Granted: 1961-06-06
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Expires: 1975-10-14
Abstract
No abstract record available.
Inventors
- 👤 James I Stevens
- 👤 John E Cottle
- 👤 William T Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:47
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1836; B01J21/00; B01J21/16; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J27/00; B01J27/06; B01J27/08; B01J27/122; B01J37/00; B01J37/08; B01J8/24; C; C08; C08F; C08F10/00; G; G11; G11C; G11C13/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00115; B01J2208/00132; B01J2208/00327; B01J2208/00336; B01J2208/00353; B01J2208/00371; B01J2208/00389; B01J2208/00407; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/584
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A PROCESS FOR THE ACTIVATION OF A SUPPORTED CHROMIUM OXIDE CATALYST FOR USE IN A POLYMERIZATION PROCESS WHEREIN SAID ACTIVATION COMPRISES HEATING SAID CATALYST IN A NONREDUCING GAS AT AN ELEVATED TEMPERATURE FOR A SUFFICIENT TIME TO IMPART POLYMERIZATION ACTIVITY TO SAID CATALYST, THE IMPROVEMENT WHICH COMPRISES, IN COMBINATION, FORMING A DENSE FLUIDIZED BED OF SAID CATALYST, SUPPLYING TO SAID BED THE MAJOR AMOUNT OF HEAT REQUIRED TO MAINTAIN SAID ELEVATED TEMPERATURE BY PASSING A HEATED FLUID IN INDIRECT HEAT EXCHANGE RELATIONSHIP WITH SAID BED, DRYING SAID GAS TO A SUBSTANTIALLY ANHYDROUS STATE, AND PASSING JUST SUFFICIENT AMOUNT OF SAID GAS THUS DRIED THROUGH SAID BED TO MAINTAIN SAID BED IN A DENSE FLUIDIZED STATE.
Claim 2
Dependent Claim
116 words
IN A PROCESS FOR THE ACTIVATION OF A SUPPORTED CHROMIUM OXIDE CATALYST FOR USE IN A POLYMERIZATION PROCESS WHEREIN SAID ACTIVATION COMPRISES HEATING SAID CATALYST IN A NONREDUCING GAS AT AN ELEVATED TEMPERATURE FOR A SUFFICIENT TIME TO IMPART POLYMERIZATION ACTIVITY TO SAID CATALYST, THE IMPROVEMENT WHICH COMPRISES, IN COMBINATION, FORMING A DENSE FLUIDIZED BED OF SAID CATALYST, SUPPLYING TO SAID BED THE MAJOR AMOUNT OF HEAT REQUIRED TO MAINTAIN SAID ELEVATED TEMPERATURE BY PASSING A HEATED FLUID IN INDIRECT HEAT EXCHANGE RELATIONSHIP WITH SAID BED, DRYING SAID GAS TO A SUBSTANTIALLY ANHYDROUS STATE, AND PASSING JUST SUFFICIENT AMOUNT OF SAID GAS THUS DRIED THROUGH SAID BED TO MAINTAIN SAID BED IN A DENSE FLUIDIZED STATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |