Patent US4950890A successfully refreshed from Google Patents.
Patent US2728795A successfully refreshed from Google Patents.
US2728795A
Expired / Lapsed
US
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Recovery of phenol
Assignee: —
•
Filing: —
•
Granted: 1955-12-27
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Expires: 1972-12-27
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:29
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84; C07C15/00; C07C15/02; C07C15/085; C07C15/40; C07C15/42; C07C15/44; C07C37/00; C07C37/08; C07C37/68; C07C37/70; C07C37/74; C07C39/00; C07C39/02; C07C39/04; C07C407/00; C07C45/00; C07C45/51; C07C45/53; C07C45/78; C07C45/81; C07C45/82; C07C49/00; C07C49/04; C07C49/08; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE PROCESS FOR THE RECOVERY OF PURE PHENOL BY FRACTIONAL DISTILLATION FROM A MIXTURE DERIVED FROM THE CATALYST DECOMPOSITION OF ISOPROPYLBENZENE HYDROPEROXIIDE, SAID MIXTURE CONTAINING ACETONE, ISOPROPYLBENZENE, A-METHYLSTYRENE PHENOL, PHENLYDIMETHYL CARBINOL ACETOPHENONE AND CUMYLPHENOL, WHICH COMPRISES FRACTIONALLY DISTILLING SAID MIXTURE TO OBTAIN (1) A PHENOL FRACTION CONTAINING A-METHYLSTYRENE AND NOT MORE THAN ABOUT 0.15% PHENYLDIMETHYL CARBINOL, (2) A RESIDUE CONTAINING PNENYLDIMETHYL CARBINOL AND CUMYLPHENOL, SUBJECTING SAID
Claim 2
Dependent Claim
66 words
THE PROCESS FOR THE RECOVERY OF PURE PHENOL BY FRACTIONAL DISTILLATION FROM A MIXTURE DERIVED FROM THE CATALYST DECOMPOSITION OF ISOPROPYLBENZENE HYDROPEROXIIDE, SAID MIXTURE CONTAINING ACETONE, ISOPROPYLBENZENE, A-METHYLSTYRENE PHENOL, PHENLYDIMETHYL CARBINOL ACETOPHENONE AND CUMYLPHENOL, WHICH COMPRISES FRACTIONALLY DISTILLING SAID MIXTURE TO OBTAIN (1) A PHENOL FRACTION CONTAINING A-METHYLSTYRENE AND NOT MORE THAN ABOUT 0.15% PHENYLDIMETHYL CARBINOL, (2) A RESIDUE CONTAINING PNENYLDIMETHYL CARBINOL AND CUMYLPHENOL, SUBJECTING SAID
References Cited (Backward Citations)
US2345625A
Cited
GB670444A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |