Patent US2492287A successfully refreshed from Google Patents.
US2520439A
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Wet grinding process
Assignee: Phillips Petroleum Co
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Filing: 1945-10-08
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Granted: 1950-08-29
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Expires: 1965-10-08
Abstract
No abstract record available.
Inventors
- 👤 Howard R Sailors
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:31
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; Y; Y10; Y10S; Y10S516/00; Y10S516/922; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A METHOD FOR DISPERSING AN ALUMINUM HALIDE CATALYST IN A SUSPENDING MEDIUM TO PROVIDE A CATALYST SUSPENSION HAVING A RETARDED RATE OF SETTLING WHICH COMPRISES GRINDING SAID ALUMINUM HALIDE IN BENZENE TO OBTAIN ALUMINUM HALIDE OF THE DESIRED PARTICLE SIZE, AND INCORPORATING IN THE RESULTING DISPERSION A SUFFICIENT QUANTITY OF A SUSPENDING MEDIUM SELECTED FROM THE CLASS CONSISTING OF BENZENE AND C4-C6 PARAFFINS TO PROVIDE A MIXTURE CONTAINING AT LEAST 20 PER CENT BY VOLUME OF HENZENE.
Claim 2
Independent Claim
77 words
A METHOD FOR DISPERSING AN ALUMINUM HALIDE CATALYST IN A SUSPENDING MEDIUM TO PROVIDE A CATALYST SUSPENSION HAVING A RETARDED RATE OF SETTLING WHICH COMPRISES GRINDING SAID ALUMINUM HALIDE IN BENZENE TO OBTAIN ALUMINUM HALIDE OF THE DESIRED PARTICLE SIZE, AND INCORPORATING IN THE RESULTING DISPERSION A SUFFICIENT QUANTITY OF A SUSPENDING MEDIUM SELECTED FROM THE CLASS CONSISTING OF BENZENE AND C4-C6 PARAFFINS TO PROVIDE A MIXTURE CONTAINING AT LEAST 20 PER CENT BY VOLUME OF HENZENE.
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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) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |