Patent US2677704A successfully refreshed from Google Patents.
US2677704A
Expired / Lapsed
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Preparation of an aminopropane diol
Assignee: Parke Davis and Co LLC
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Filing: 1952-07-10
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Granted: 1954-05-04
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Expires: 1972-07-10
Abstract
No abstract record available.
Inventors
- 👤 Jacob Robert Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:17
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A PROCESS FOR THE PREPARATION OF 2-O-CARBOXYBENZAMIDO-1-P-NITROPHENYLPROPANE 1:3-DIOL WHICH COMPRISES REACTING P-NITROBENZALDEHYDE WITH A-PHTHALIMIDOACETALDEHYDE IN THE PRESENCE OF A BASIC CONDENSING AGENT OF THE CLASS CONSISTING OF ALKALI METAL HYDRIDE AND ALKALI METAL ALCOHOLATE IN A SOLVENT MEDIUM CONSISTING OF A SOLVENT OF THE CLASS CONSISTING OF CYCLIC ETHEROXIDES, ALIPHATIC NITRILES AND TERTIARY AMIDES FOR A PERIOD NOT EXCEEDING A FEW HOURS AND DIRECTLY TREATING THE CONDENSATION REACTION MIXTURE THUS OBTAINED WITH AN ALKALI METAL BOROHYDRIDE TOGETHER WITH A QUANTITY OF METHANOL AS REDUCTION PROMOTER BY HYDROLYZING THE REDUCTION PRODUCT THUS OBTAINED UNDER ALKALINE CONDITIONS AND ACIDIFYING TO PRECIPITATE SAID DIOL.
Claim 2
Dependent Claim
101 words
A PROCESS FOR THE PREPARATION OF 2-O-CARBOXYBENZAMIDO-1-P-NITROPHENYLPROPANE 1:3-DIOL WHICH COMPRISES REACTING P-NITROBENZALDEHYDE WITH A-PHTHALIMIDOACETALDEHYDE IN THE PRESENCE OF A BASIC CONDENSING AGENT OF THE CLASS CONSISTING OF ALKALI METAL HYDRIDE AND ALKALI METAL ALCOHOLATE IN A SOLVENT MEDIUM CONSISTING OF A SOLVENT OF THE CLASS CONSISTING OF CYCLIC ETHEROXIDES, ALIPHATIC NITRILES AND TERTIARY AMIDES FOR A PERIOD NOT EXCEEDING A FEW HOURS AND DIRECTLY TREATING THE CONDENSATION REACTION MIXTURE THUS OBTAINED WITH AN ALKALI METAL BOROHYDRIDE TOGETHER WITH A QUANTITY OF METHANOL AS REDUCTION PROMOTER BY HYDROLYZING THE REDUCTION PRODUCT THUS OBTAINED UNDER ALKALINE CONDITIONS AND ACIDIFYING TO PRECIPITATE SAID DIOL.
References Cited (Backward Citations)
US2483885A
Cited
US2516098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |