US2992238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor phase preparation of styrene oxide
Assignee: Dow Chemical Co
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Filing: 1959-03-20
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Granted: 1961-07-11
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Expires: 1979-03-20
Abstract
No abstract record available.
Inventors
- 👤 Stanley D Zimmerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:48
CPC Classifications
C; C07; C07D; C07D303/00; C07D303/02; C07D303/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
124 words
A METHOD OF PREPARING A GLYCIDYL ESTER OF LONG COMPRISES REACTING AT A TEMPERATURE BETWEEN 200* AND 350*C. AND A SPACE VELOCITY BETWEEN ABOUT 500 AND ABOUT 1100 VOLUMES PER MINUTE OF A GASEOUS MIXTURE CONTAINING EXCESS MOLECULAR OXYGEN AND BETWEEN 0.5 AND 15 PERCENT BY WEIGHT OF STYRENE PER VOLUME OF A SUPPORTED SILVER CATALYST WHICH HAS BEEN PREPARED BY HEATING A POLYHYDRIC ALCOHOL-COMPOUND WETTED MIXTURE COMPRISING A CONVENTIONAL PARTICULATE INERT CATALYST SUPPORT AND AT LEAST ONE REDUCIBLE SILVER COMPOUND OF THE GROUP CONSISTING OF SILVER OXIDE, SILVER CARBONATE AND SILVER OXALATE TO A REACTION TEMPERATURE BETWEEN 110*C. AND 200*C. FOR A TIME SUFFICIENT TO REDUCE THE SILVER COMPOUND TO METALLIC SILVER AND TO VAPORIZE VOLATILE REACTION PRODUCTS, AND RECOVERING STYRENE OXIDE PRODUCT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |