US3849448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase oxidation of benzene to maleic anhydride at low oxygen to benzene molar ratios and high benzene concentrations
Assignee: Individual
•
Filing: 1971-10-18
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Granted: 1974-11-19
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Expires: 1991-10-18
Abstract
Abstract 1. A PROCESS FOR THE PRODUCTION OF MALEIC ANHYDRIDE BY THE CATALYTIC PARTIAL OXIDATION OF BENZENE COMPRISING THE STEPS OF CONTACTING BENZENE AND MOLECULAR OXYGEN, SAID GASTURE CONTAINING BENZENE AND MOLECULAR OXYGEN, SAID GASEOUS MIXTURE CONTAINING AT LEAST 4.55 VOLUME PERCENT OF BENZENE AND HAVING AN OXYGEN TO BENZENE MOLAR RATIO OF LESS THAN 4.5 TO 1, WITH A FLUIDISED OXIDATION CATALYST AND SEPARATING MALEIC ANHYDRIDE FROM THE RESULTANT GASEOUS MIXTURE.
Inventors
- 👤 C Crampton
- 👤 C Cardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:11
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR THE PRODUCTION OF MALEIC ANHYDRIDE BY THE CATALYTIC PARTIAL OXIDATION OF BENZENE COMPRISING THE STEPS OF CONTACTING BENZENE AND MOLECULAR OXYGEN, SAID GASTURE CONTAINING BENZENE AND MOLECULAR OXYGEN, SAID GASEOUS MIXTURE CONTAINING AT LEAST 4.55 VOLUME PERCENT OF BENZENE AND HAVING AN OXYGEN TO BENZENE MOLAR RATIO OF LESS THAN 4.5 TO 1, WITH A FLUIDISED OXIDATION CATALYST AND SEPARATING MALEIC ANHYDRIDE FROM THE RESULTANT GASEOUS MIXTURE.
Claim 2
Dependent Claim
70 words
A PROCESS FOR THE PRODUCTION OF MALEIC ANHYDRIDE BY THE CATALYTIC PARTIAL OXIDATION OF BENZENE COMPRISING THE STEPS OF CONTACTING BENZENE AND MOLECULAR OXYGEN, SAID GASTURE CONTAINING BENZENE AND MOLECULAR OXYGEN, SAID GASEOUS MIXTURE CONTAINING AT LEAST 4.55 VOLUME PERCENT OF BENZENE AND HAVING AN OXYGEN TO BENZENE MOLAR RATIO OF LESS THAN 4.5 TO 1, WITH A FLUIDISED OXIDATION CATALYST AND SEPARATING MALEIC ANHYDRIDE FROM THE RESULTANT GASEOUS MIXTURE.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |