Patent US2504034A successfully refreshed from Google Patents.
US2504034A
Expired / Lapsed
US
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Production of maleic acid from branched-chain dienes
Assignee: Standard Oil Development Co
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Filing: 1948-08-13
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Granted: 1950-04-11
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Expires: 1968-08-13
Abstract
No abstract record available.
Inventors
- 👤 Charles E Morrell
- 👤 Leland K Beach
- 👤 Mary E Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:19
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A PROCESS FOR THE PREPARATION OF MALEIC ACID WHICH COMPRISES SELECTIVELY OXIDIZING A GASEOUS MIXTURE OF C6 DIOLEFINS OF BOILDING RANGE 65-80*C., AND CONSISTING ESSENTIALLY OF METHYL PENTADIENES, WITH AIR IN THE PRESENCE OF A VANADIUM OXIDE CATALYST AT A TEMPERATURE OF 500-600*C.
References Cited (Backward Citations)
FR857643A
Cited
US2260409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |