US2930802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidation of alkylnaphthalenes
Assignee: Individual
•
Filing: 1957-09-16
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Granted: 1960-03-29
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Expires: 1977-09-16
Abstract
No abstract record available.
Inventors
- 👤 Robert S Aries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:20
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/255; C07C51/265; C07C51/31; C07C51/313
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
METHOD FOR THE CONVERSION OF LOWER ALKYLNAPHTALENES TO PHTHALIC ANHYDRIDE WHICH COMPRISES IN A FIRST STAGE OXIDIZING SAID LOWER ALKYLNAPHTALENES TO NAPHTHOIC ACID IN THE LIQUID PHASE BY MEANS OF AIR IN THE PRESENCE OF A COBALT CONTAINING OXIDATION CATALYST AT A TEMPERATURE BETWEEN ABOUT 150* AND 180*C., AND IN A SECOND STAGE CONVERTING SAID NAPHTHOIC ACID IN THE VAPOR PHASE IN THE PRESENCE OF AIR, AND A VANADIUM CONTAINING OXIDATION CATALYST AT A TEMPERATURE BETWEEN ABOUT 425* AND 475* C., TO PHTHALIC ANHYDRIDE.
Claim 2
Dependent Claim
84 words
METHOD FOR THE CONVERSION OF LOWER ALKYLNAPHTALENES TO PHTHALIC ANHYDRIDE WHICH COMPRISES IN A FIRST STAGE OXIDIZING SAID LOWER ALKYLNAPHTALENES TO NAPHTHOIC ACID IN THE LIQUID PHASE BY MEANS OF AIR IN THE PRESENCE OF A COBALT CONTAINING OXIDATION CATALYST AT A TEMPERATURE BETWEEN ABOUT 150* AND 180*C., AND IN A SECOND STAGE CONVERTING SAID NAPHTHOIC ACID IN THE VAPOR PHASE IN THE PRESENCE OF AIR, AND A VANADIUM CONTAINING OXIDATION CATALYST AT A TEMPERATURE BETWEEN ABOUT 425* AND 475* C., TO PHTHALIC ANHYDRIDE.
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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |