US2954385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of maleic and phthalic anhydrides
Assignee: Standard Oil Co
•
Filing: 1957-10-02
•
Granted: 1960-09-27
•
Expires: 1977-10-02
Abstract
No abstract record available.
Inventors
- 👤 Donald E Burney
- 👤 Melvern C Hoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:01
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE CATALYTIC VAPOR PHASE OXIDATION OF NAPHTHALENE TO PHTHALIC ANHYTDRIDE WHICH COMPRISES REACTING VAPORIZED NAPHTHALENE WITH OXYGEN IN THE PRESENCE OF A METAL OXIDE OXIDATION CATALYST, SAID METAL COMPRISING A MEMBER OF GROUPS V-B AND VI-B OF THE PERIODIC TABLE OF ELEMENTS, AND IN THE PRESENCE OF A SMALL PROMOTIONAL AMOUNT OF A VOLATILE BROMINE COMPOUND FREE FROM METALLIC CONSTITUENTS.
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR THE CATALYTIC VAPOR PHASE OXIDATION OF AN AROMATIC HYDROCARBON TO A DICARBOXYLIC ACID ANHYDRIDE WHEREIN THE VAPORIZED HYDROCARBON IS REACTED WITH OXYGEN IN THE PRESENCE OF A METAL OXIDE OXIDATION CATALYST, SAID METAL COMPRISING A MEMBER OF GROUPS V-B AND BI-B OF THE PERIODIC TABLE OF ELEMENTS, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID REACTION THE PRESENCE OF A SMALL PROMOTIONAL AMOUNT OF A VOLATILE BROMINE COMPOUND FREE FROM METALLIC CONSTITUENTS.
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) | 1963-09-27 | 1964-03-28 | 1964-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-27 | 1968-03-28 | 1968-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-27 | 1972-03-28 | 1972-09-27 | $7700.00 | Window Closed / Lapsed |