US2537568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cis-butene oxidation
Assignee: Standard Oil Development Co
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Filing: 1949-01-03
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Granted: 1951-01-09
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Expires: 1969-01-03
Abstract
No abstract record available.
Inventors
- 👤 Leland K Beach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/28; C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
A PROCESS FOR THE PREPARATION OF MALEIC ACID WHICH COMPRISES OXIDIZING CIS-2-BUTENE SUBSTANTIALLY FREE TRANS-2-BUTENE WITH AN OXYGEN-CONTAINING GAS IN THE PRESENCE OF A VANADIUM OXIDE CATALYST AT TEMPERATURE OF 300* C.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |