US3767596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrogenation catalysts
Assignee: Texas Petrochemicals Corp
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Filing: 1971-09-09
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Granted: 1973-10-23
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Expires: 1991-09-09
Abstract
Abstract BERYLLIUM CHROMITES, ESPECIALLY THOSE PROMOTED WITH ALUMINUM, HAVE BEEN FOUND TO BE COMPARABLE TO CHROMIA-ALUMINA TYPE DEHYDROGENATION CATALYSTS, FOR EXAMPLE, IN THE DEHYDROGENATION OF N-BUTANE. THE ALUMINUM IS EITHER ADDED TO THE PREFORMED BERYLLIUM CHROMITE OR IS INCOPORATED INTO THE SPINEL STRUCTURE OF THE CHROMITE ITSELF OR ADDED IN BOTH WAYS. THE ALUMINUM CAN BE PRESENT IN THE CATALYST FROM ALL SOURCES IN AN ATOMIC RATIO OF A1:CR OF 0.0004 TO 1.2:1. THE ATOMIC RATIO WILL MORE USUALLY BE 0.04 TO 0.8:1, A1:CR.
Inventors
- 👤 H Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J23/32; B01J23/34; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/901; Y10S585/906
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |