US2998457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phenols
Assignee: Ashland LLC
•
Filing: 1958-11-19
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Granted: 1961-08-29
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Expires: 1978-11-19
Abstract
No abstract record available.
Inventors
- 👤 Thorwell H Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:21
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/50; C07C1/00; C07C1/20; C07C2521/00; C07C2521/02; C07C2521/04; C07C2523/00; C07C2523/16; C07C2523/24; C07C2523/26; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/942
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
94 words
A PROCESS FOR OBTAINING PHENOL FROM XYLENOLS WHICH PROCESS COMPRISES, SUBJECTING THE XYLENOLS TO CATALYTIC CRACKING CONDITIONS IN THE PRESENCE OF HYDROGEN AND A CATALYST CONSISTING OF APPROXIMATELY 10 TO 15% BY WEIGHT OF CHROMIUM OXIDE ON A HIGH PURITY LOW SODIUM CONTENT GAMMA TYPE ALUMINA SUPPORT, AT A TEMPERATURE IN THE RANGE FROM APPROXIMATELY 1200*F. TO APPROXIMATELY 1250*F., AT A PRESSURE IN THE RANGE FROM ABOUT 100 TO 1000 P.S.I.G., FOR A PERIOD OF TIME FROM ABOUT 5 TO ABOUT 100 SECONDS, AND SEPARATING PHENOL FROM THE LIQUID PRODUCT RESULTING FROM THE TREATMENT.
References Cited (Backward Citations)
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Cited
US2398687A
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US2705733A
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US2636843A
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US2780661A
Cited
US2773917A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |