US3781376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrogenation process and catalyst
Assignee: Texas Petrochemicals Corp
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Filing: 1971-06-30
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Granted: 1973-12-25
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Expires: 1991-06-30
Abstract
Abstract MAGNESIUM CHROMITES PROMOTED WITH ALUMINUM HAVE BEEN FOUND TO BE SUPERIOR TO CHROMIA-ALUMINA TYPE DEHYDROGENATION CATALYSTS, FOR EXAMPLE, IN THE DEHYDROGENATION OF N-BUTANE. THE ALUMINUM IS EITHER ADDED TO THE PREFORMED MAGNESIUM CHROMITE OR IS INCORPORATED INTO THE SPINEL STRUCTURE OF THE CHROMITE ITSELF OR ADDED IN BOTH WAYS. THE ALUMINUM WILL BE PRESENT IN THE CATALYST FROM ALL SOURCES IN AN ATOMIC RATIO OF AL:CR OF 0.0004 TO 1.2:1. THE ATOMIC RATIO WILL MORE USUALLY BE 0.04 TO 0.8:1, AL:CR.
Inventors
- 👤 H Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:50
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; C07C5/321; C07C5/322
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |