US2674582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation catalyst
Assignee: Monsanto Chemicals Ltd
•
Filing: 1953-01-02
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Granted: 1954-04-06
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Expires: 1973-01-02
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Darby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:54
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/20; B01J23/22; C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A CATALYST FOR THE VAPOR PHASE OXIDATION OF BENZENE TO MALEIC ANHYDRIDE WHICH COMPRISES A POROUS, INERT MASS OF FINELY SUBDIVIDED SILICA, THE PARTICLES OF WHICH ARE BONDED TOGETHER BY A MATRIX OF A REFRACTORY GLASS WHICH IS HIGH IN SILICA AND LOW IN BASIC CONSTITUENTS, THE BONDED SILICA PARTICLES BEING IMPREGNATED WITH A CATALYTICALLY ACTIVE MATERIAL CONTAINING VANADIUM, THE PORTION OF THE CATALYSTIC BED WHICH IS TO BE IN INITIAL CONTACT WITH THE MIXTURE OF BENZENE AND OXYGEN BEING MADE UP SUBSTANTIALLY OF PARTICLES OF SUCH A SIZE AS TO BE RETAINED BY A 4 MESH SCREEN AND THE BALANCE OF THE BED BEING MADE UP SUBSTANTIALLY OF PARTICLES OF SUCH A SIZE AS TO PASS THROUGH A 4 MESH SCREEN AND BE RETAINED BY A 6 MESH SCREEN.
Claim 2
Dependent Claim
130 words
A CATALYST FOR THE VAPOR PHASE OXIDATION OF BENZENE TO MALEIC ANHYDRIDE WHICH COMPRISES A POROUS, INERT MASS OF FINELY SUBDIVIDED SILICA, THE PARTICLES OF WHICH ARE BONDED TOGETHER BY A MATRIX OF A REFRACTORY GLASS WHICH IS HIGH IN SILICA AND LOW IN BASIC CONSTITUENTS, THE BONDED SILICA PARTICLES BEING IMPREGNATED WITH A CATALYTICALLY ACTIVE MATERIAL CONTAINING VANADIUM, THE PORTION OF THE CATALYSTIC BED WHICH IS TO BE IN INITIAL CONTACT WITH THE MIXTURE OF BENZENE AND OXYGEN BEING MADE UP SUBSTANTIALLY OF PARTICLES OF SUCH A SIZE AS TO BE RETAINED BY A 4 MESH SCREEN AND THE BALANCE OF THE BED BEING MADE UP SUBSTANTIALLY OF PARTICLES OF SUCH A SIZE AS TO PASS THROUGH A 4 MESH SCREEN AND BE RETAINED BY A 6 MESH SCREEN.
References Cited (Backward Citations)
US2510803A
Cited
US2625554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |