US2778804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization catalyst and process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1951-07-31
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Granted: 1957-01-22
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Expires: 1971-07-31
Abstract
No abstract record available.
Inventors
- 👤 Eugene S Corner
- 👤 Charles S Lynch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:09
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2521/00; C07C2521/06; C07C2521/08; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE PROCESS OF PRODUCING AN OLEFIN POLYMERIZATION CATALYST WHICH COMPRISES FORMING AN INTIMATE MIXTURE COMPRISING A SILICA HYDROGEL AND A PHOSPHORIC ACID, SAID HYDROGEL CONTAINING FROM ABOUT 50 TO ABOUT 90% BY WEIGHT OF WATER, DRYING THE MIXTURE, AND THEN CALCINING THE CATALYST AT AN ELEVATED TEMPERATURE.
Claim 2
Dependent Claim
47 words
THE PROCESS OF PRODUCING AN OLEFIN POLYMERIZATION CATALYST WHICH COMPRISES FORMING AN INTIMATE MIXTURE COMPRISING A SILICA HYDROGEL AND A PHOSPHORIC ACID, SAID HYDROGEL CONTAINING FROM ABOUT 50 TO ABOUT 90% BY WEIGHT OF WATER, DRYING THE MIXTURE, AND THEN CALCINING THE CATALYST AT AN ELEVATED TEMPERATURE.
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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) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |