US2649477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of maleic acid
Assignee: Distillers Co Yeast Ltd
•
Filing: 1950-12-04
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Granted: 1953-08-18
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Expires: 1970-12-04
Abstract
No abstract record available.
Inventors
- 👤 Jacobs David Ian Hutchinson
- 👤 Hadley David James
- 👤 Heap Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:46
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/25; C07C51/252
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR THE MANUFACTURE OF MALEIC ACID, WHICH COMPRISES OXIDISING AN UNSATURATED ALIPHATIC COMPOUND OF 4 TO 8 CARBON ATOMS IN THE VAPOUR PHASE BY MEANS OF A MOLECULAR OXYGENCONTAINING GAS IN THE PRESENCE OF A CATALYST COMPRISING THE OXIDES OF PHOSPHORUS AND MOLYBDENUM, SAID CATALYST BEING SUBSTANTIALLY FREE FROM VANADIUM AND ITS COMPOUNDS.
Claim 2
Dependent Claim
55 words
A PROCESS FOR THE MANUFACTURE OF MALEIC ACID, WHICH COMPRISES OXIDISING AN UNSATURATED ALIPHATIC COMPOUND OF 4 TO 8 CARBON ATOMS IN THE VAPOUR PHASE BY MEANS OF A MOLECULAR OXYGENCONTAINING GAS IN THE PRESENCE OF A CATALYST COMPRISING THE OXIDES OF PHOSPHORUS AND MOLYBDENUM, SAID CATALYST BEING SUBSTANTIALLY FREE FROM VANADIUM AND ITS COMPOUNDS.
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) | 1956-08-17 | 1957-02-16 | 1957-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-17 | 1961-02-16 | 1961-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-17 | 1965-02-16 | 1965-08-18 | $7700.00 | Window Closed / Lapsed |