US2500482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic dehydrogenation
Assignee: Shell Development Co
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Filing: 1947-07-30
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Granted: 1950-03-14
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Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Barter Cyril
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:23
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; C07C5/321; C07C5/322; C07C5/373; C07C5/393; C07C5/41; C07C5/412; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN THE DEHYDROGENATION OF A SATURATED HYDROCARBON WITH A CHROMIUM OXIDE CATALYST IN THE ABSENCE OF ADDED HYDROGEN WHEREIN THE CATALYST IS PERIODICALLY REGENERATED BY BURNING CARBONACEOUS DEPOSITS THEREFROM, THE IMPROVEMENT WHICH COMPRISES SATURATING THE CATALYST WITH SUBSTANTIALLY DRY CARBON MONOXIDE AFTER SAID REGENERATION AND PRIOR TO CONTACTING IT WITH THE MATERIAL TO BE DEHYDROGENATED, SAID SATURATION OF THE CATALYST BEING EFFECTED WITHOUT PREHEATING THE CATALYST AFTER REGENERATION TO A TEMPERATURE HIGER THAN THE CONVERSION TEMPERATURE BY TREATING THE UNPREHEATED CATALYST WITH SUBSTANTIALLY DRY CARBON MONOXIDE AT SUBSTANTIALLY THE TEMPERATURE AT WHICH THE CATALYST IS USED IN THE DEHYDROGENATION, AND THEN CONTACTING THE CATALYST SATURATED WITH CARBON MONOXIDE WITH THE MATERIAL TO BE DEHYDROGENATED.
Claim 2
Dependent Claim
114 words
IN THE DEHYDROGENATION OF A SATURATED HYDROCARBON WITH A CHROMIUM OXIDE CATALYST IN THE ABSENCE OF ADDED HYDROGEN WHEREIN THE CATALYST IS PERIODICALLY REGENERATED BY BURNING CARBONACEOUS DEPOSITS THEREFROM, THE IMPROVEMENT WHICH COMPRISES SATURATING THE CATALYST WITH SUBSTANTIALLY DRY CARBON MONOXIDE AFTER SAID REGENERATION AND PRIOR TO CONTACTING IT WITH THE MATERIAL TO BE DEHYDROGENATED, SAID SATURATION OF THE CATALYST BEING EFFECTED WITHOUT PREHEATING THE CATALYST AFTER REGENERATION TO A TEMPERATURE HIGER THAN THE CONVERSION TEMPERATURE BY TREATING THE UNPREHEATED CATALYST WITH SUBSTANTIALLY DRY CARBON MONOXIDE AT SUBSTANTIALLY THE TEMPERATURE AT WHICH THE CATALYST IS USED IN THE DEHYDROGENATION, AND THEN CONTACTING THE CATALYST SATURATED WITH CARBON MONOXIDE WITH THE MATERIAL TO BE DEHYDROGENATED.
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) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |