US2848422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of active contact masses from kaolin clays
Assignee: Houdry Process Corp
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Filing: 1955-06-06
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Granted: 1958-08-19
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Expires: 1975-06-06
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Donovan
- 👤 Jr Thomas H Milliken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:13
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
A METHOD FOR FORMING HYDROCARBON CONVERSION CATALYST WHICH COMPRISES CONTACTING A KAOLIN CLAY AT A TEMPERATURE OF BETWEEN ABOUT 650 TO 900*F. WITH A GAS CONTAINING FROM ABOUT 6 MOL PERCENT TO ABOUT 45 MOL PERCENT SULFUR TRIOXIDE FOR A PERIOD AT LEAST SUFFICIENT TO EFFECT INCORPORATION OF ABOUT 22% SO3 BY WEIGHT IN THE CLAY, AND THEN DESULFATING THE CLAY BY CONTACTING IT WITH A REDUCING GAS AT ELEVATED TEMPERATURES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |