US2585899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysis of alkyl aromatic isomerization
Assignee: California Research LLC
•
Filing: 1947-07-02
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Granted: 1952-02-12
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Expires: 1967-07-02
Abstract
No abstract record available.
Inventors
- 👤 Gordon E Langlois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:51
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/274; C07C5/2745
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A PROCESS FOR ISOMERIZING A DIALKYL BENZENE HAVING NOT MORE THAN 3 CARBON ATOMS IN EACH ALKYL GROUP WHICH COMPRISES CONTACTING SAID DIALKYL BENZENE WITH A SOLID ISOMERIZATION CATALYST CONTAINING PHOSPHORIC ACID AT A CONCENTRATION IN THE RANGE 95 TO 110% CALCULATED AS ORTHO-PHOSPHORIC ACID AS THE EFFECTIVE CATALYTIC MATERIAL AT A TEMPERATURE IN THE RANGE 400* F. TO 1100* F. AND AT A SPACE VELOCITY IN THE RANGE 0.05 TO 5.0 VOLUMES OF LIQUID DIALKYL BENZENE PER VOLUME OF CATALYST PER HOUR THE TEMPERATURE WITHIN SAID TEMPERA-
Claim 2
Dependent Claim
88 words
A PROCESS FOR ISOMERIZING A DIALKYL BENZENE HAVING NOT MORE THAN 3 CARBON ATOMS IN EACH ALKYL GROUP WHICH COMPRISES CONTACTING SAID DIALKYL BENZENE WITH A SOLID ISOMERIZATION CATALYST CONTAINING PHOSPHORIC ACID AT A CONCENTRATION IN THE RANGE 95 TO 110% CALCULATED AS ORTHO-PHOSPHORIC ACID AS THE EFFECTIVE CATALYTIC MATERIAL AT A TEMPERATURE IN THE RANGE 400* F. TO 1100* F. AND AT A SPACE VELOCITY IN THE RANGE 0.05 TO 5.0 VOLUMES OF LIQUID DIALKYL BENZENE PER VOLUME OF CATALYST PER HOUR THE TEMPERATURE WITHIN SAID TEMPERA-
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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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |