US2601538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic isomerization of propylene oxide to propionaldehyde, catalyst therefor, and synthesis of catalyst
Assignee: Wyandotte Chemicals Corp
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Filing: 1948-07-02
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Granted: 1952-06-24
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Expires: 1968-07-02
Abstract
No abstract record available.
Inventors
- 👤 Lester G Lundsted
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:45
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C07; C07C; C07C45/00; C07C45/56; C07C45/57; C07C45/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE PROCESS OF MAKING PROPIONALDEHYDE COMPRISING PASSING PROPYLENE OXIDE VAPOR OVER A HEATED CHROMIC OXIDE -TUNGSTIC OXIDE COMPLEX CATALYST SELECTED FROM THE GROUP CONSISTING OF A CATALYST PREPARED BY REACTING CHROMIUM NITRATE WITH SODIUM TUNGSTATE IN AQUEOUS SOLUTION, WASHING THE PRECIPITATE FREE OF SODIUM NITRATE AND FILTERING AND HEAT-DRYING THE PRECIPITATE, AND A CATALYST PREPARED BY HEATING AN INTIMATE PHYSICAL MIXTURE OF CHROMIC OXIDE AND TUNGSTIC ACID TO FORM A COMPLEX THEREOF HAVING HIGH CATALYTIC ACTIVITY.
Claim 2
Dependent Claim
76 words
THE PROCESS OF MAKING PROPIONALDEHYDE COMPRISING PASSING PROPYLENE OXIDE VAPOR OVER A HEATED CHROMIC OXIDE -TUNGSTIC OXIDE COMPLEX CATALYST SELECTED FROM THE GROUP CONSISTING OF A CATALYST PREPARED BY REACTING CHROMIUM NITRATE WITH SODIUM TUNGSTATE IN AQUEOUS SOLUTION, WASHING THE PRECIPITATE FREE OF SODIUM NITRATE AND FILTERING AND HEAT-DRYING THE PRECIPITATE, AND A CATALYST PREPARED BY HEATING AN INTIMATE PHYSICAL MIXTURE OF CHROMIC OXIDE AND TUNGSTIC ACID TO FORM A COMPLEX THEREOF HAVING HIGH CATALYTIC ACTIVITY.
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) | 1955-06-24 | 1955-12-24 | 1956-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-24 | 1959-12-24 | 1960-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-24 | 1963-12-24 | 1964-06-24 | $7700.00 | Window Closed / Lapsed |