US2533203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of c-alkyl hydroquinones and c-alkyl p-aminophenols
Assignee: Eastman Kodak Co
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Filing: 1948-07-16
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Granted: 1950-12-12
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Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Frederic R Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:34
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/01; C07C37/045; C07C213/00; C07C213/02; C07C37/58
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A PROCESS FOR PREPARING AN ALKYL SUBSTITUTED HYDROQUINONE COMPRISING REDUCING A NITROPHEYL COMPOUND CONTAINING IN THE PARA POSITION A PRIMARY ALKYL GROUP HAVING FROM 1 TO 4 CARBON ATOMS, SIMULTANEOUSLY WITH FINELY DIVIDED ALUMINUM AND AN AQUEOUS SOLUTION OF AN ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, PHOSPHORIC ACID, HYDROCHLORIC ACID, OXALIC ACID, AN ALKANE SULFONIC ACID CONTAINING FROM 1 TO 4 CARBON ATOMS, A SULFONIC ACID OF THE BENZENE SERIES AND A SULFONIC ACID OF THE NAPHTHALENE SERIES, SAID SOLUTION CONTAINING NOT MORE THAN 50% BY WEIGHT OF SAID ACID, THE QUANTITY OF SAID ACID PRESENT BEING SUFFICIENT TO MAINTAIN AN ACID MEDIUM UNTIL THE REDUCTION IS SUBSTANTIALLY COMPLETE, AND SEPARATING THE ALKYL-SUBSTITUTED HYDROQUINONE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
121 words
A PROCESS FOR PREPARING AN ALKYL SUBSTITUTED HYDROQUINONE COMPRISING REDUCING A NITROPHEYL COMPOUND CONTAINING IN THE PARA POSITION A PRIMARY ALKYL GROUP HAVING FROM 1 TO 4 CARBON ATOMS, SIMULTANEOUSLY WITH FINELY DIVIDED ALUMINUM AND AN AQUEOUS SOLUTION OF AN ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC ACID, PHOSPHORIC ACID, HYDROCHLORIC ACID, OXALIC ACID, AN ALKANE SULFONIC ACID CONTAINING FROM 1 TO 4 CARBON ATOMS, A SULFONIC ACID OF THE BENZENE SERIES AND A SULFONIC ACID OF THE NAPHTHALENE SERIES, SAID SOLUTION CONTAINING NOT MORE THAN 50% BY WEIGHT OF SAID ACID, THE QUANTITY OF SAID ACID PRESENT BEING SUFFICIENT TO MAINTAIN AN ACID MEDIUM UNTIL THE REDUCTION IS SUBSTANTIALLY COMPLETE, AND SEPARATING THE ALKYL-SUBSTITUTED HYDROQUINONE FROM THE REACTION MIXTURE.
Claim 3
Dependent Claim
18 words
A PROCESS FOR PREPARING A MIXTURE OF AN ALKYL HYDROQUINONE SELECTED FROM THOSE REPRESENTED BY THE GENERAL FORMULA:
Claim 4
Dependent Claim
18 words
A PROCESS FOR PREPARING A MIXTURE OF AN ALKYL HYDROQUINONE SELECTED FROM THOSE REPRESENTED BY THE GENERAL FORMULA:
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |