US2963518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic thermal treatment of xylene-containing hydrocarbons
Assignee: Dow Chemical Co
•
Filing: 1954-09-24
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Granted: 1960-12-06
•
Expires: 1974-09-24
Abstract
No abstract record available.
Inventors
- 👤 James L Amos
- 👤 Frederick J Soderquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:07
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/321; C07C5/322; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/20; C07C5/327; C07C5/333; C07C5/3332; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/16; C07C2523/24; C07C2523/26; C07C2523/70; C07C2523/74; C07C2523/745
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD WHICH COMPRISES PASSING A VAPOR MIXTURE OF AT LEAST ONE PARTY BY WEIGHT OF STEAM AND ONE PART BY WEIGHT OF HYDROCARBON MATERIAL, COMPRISING AT LEAST ONE AROMATIC HYDROCARBON OF THE CLASS CONSISTING OF XYLENES AND MIXTURES OF AT LEAST ONE XYLENE AND ETHYLBENZENE, INTO CONTACT WITH A SELF-REGENERATIVE DEHYDROGENATION CATALYST COMPRISING AS ESSENTIAL INGREDIENTS A HEAVY METAL COMPOUND, EFFECTIVE AS A DEHYDROGENATION CATALYST, TOGETHER WITH A BASIC POTASSIUM COMPOUND AT A REACTION TEMPERATURE BETWEEN 600* AND 800*C.
Claim 2
Independent Claim
80 words
A METHOD WHICH COMPRISES PASSING A VAPOR MIXTURE OF AT LEAST ONE PARTY BY WEIGHT OF STEAM AND ONE PART BY WEIGHT OF HYDROCARBON MATERIAL, COMPRISING AT LEAST ONE AROMATIC HYDROCARBON OF THE CLASS CONSISTING OF XYLENES AND MIXTURES OF AT LEAST ONE XYLENE AND ETHYLBENZENE, INTO CONTACT WITH A SELF-REGENERATIVE DEHYDROGENATION CATALYST COMPRISING AS ESSENTIAL INGREDIENTS A HEAVY METAL COMPOUND, EFFECTIVE AS A DEHYDROGENATION CATALYST, TOGETHER WITH A BASIC POTASSIUM COMPOUND AT A REACTION TEMPERATURE BETWEEN 600* AND 800*C.
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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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |