Patent US2945870A successfully refreshed from Google Patents.
US2945870A
Expired / Lapsed
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Method for preparing n-acyl-p-amino phenols
Assignee: Sinclair Refining Co
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Filing: 1958-10-24
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Granted: 1960-07-19
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Expires: 1978-10-24
Abstract
No abstract record available.
Inventors
- 👤 David W Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:00
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN THE N-ACYLATION OF A P-AMINO PHENOL BY CONDENSATION WITH A MONOCARBOXYLIC ACID OF 2 TO 21 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE CONDENSATION REACTION IN AN ATMOSPHERE OF SULFUR DIOXIDE AND IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIOXIDE AND METABORIC ACID OF 176* C. MELTING POINT.
Claim 2
Dependent Claim
57 words
IN THE N-ACYLATION OF A P-AMINO PHENOL BY CONDENSATION WITH A MONOCARBOXYLIC ACID OF 2 TO 21 CARBON ATOMS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE CONDENSATION REACTION IN AN ATMOSPHERE OF SULFUR DIOXIDE AND IN THE PRESENCE OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIOXIDE AND METABORIC ACID OF 176* C. MELTING POINT.
References Cited (Backward Citations)
US2711415A
Cited
US2799692A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |