US2694686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phosphoric acid catalysts comprising a calcined silicon phosphoric base
Assignee: Standard Oil Development Co
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Filing: 1950-12-01
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Granted: 1954-11-16
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Expires: 1970-12-01
Abstract
No abstract record available.
Inventors
- 👤 Edward D Reeves
- 👤 Kenneth K Kearby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:08
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; Y; Y10; Y10T; Y10T29/00; Y10T29/51; Y10T29/5116
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
AN IMPROVED PROCESS FOR PREPARING AN OLEFIN POLYMERIZATION CATALYST WHICH COMPRISES MIXING AN ACID OF PHOSPHOUS AND SILICA GEL PROVIDING AN ATOMIC RATION OF PHOSPHORUS TO SILICA GEL OF ABOUT 2 TO 4 DRYING THE SAID MIXTURE, CALCINING THE DRIED MIXTURE AT A TEMPERATURE OF
Claim 2
Dependent Claim
45 words
AN IMPROVED PROCESS FOR PREPARING AN OLEFIN POLYMERIZATION CATALYST WHICH COMPRISES MIXING AN ACID OF PHOSPHOUS AND SILICA GEL PROVIDING AN ATOMIC RATION OF PHOSPHORUS TO SILICA GEL OF ABOUT 2 TO 4 DRYING THE SAID MIXTURE, CALCINING THE DRIED MIXTURE AT A TEMPERATURE OF
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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) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |