US2996545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical resolution of alpha-(alpha-naphthyl) ethylamine
Assignee: Chemetron Corp
•
Filing: 1957-08-05
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Granted: 1961-08-15
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Expires: 1977-08-05
Abstract
No abstract record available.
Inventors
- 👤 Robert R Bottoms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:10
CPC Classifications
C; C07; C07C; C07C213/00; C07C213/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF RESOLVING RACEMIC ALPHA-(ALPHA-NAPHTHYL) ETHYLAMINE INTO ITS OPTICALLY ACTIVE ISOMERS WHICH COMPRISES DISSOLVING DL-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE AND D-TARTARIC ACID IN WARM, SUBSTANTIALLY ANHYDROUS METHANOL, COOLING SAID SOLUTION TO A TEMPERATURE NOT LOWER THAN ABOUT 55*C. TO CAUSE THE PRECIPITATION OF DALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE D-TARTRATE, SEPARATING SAID D-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE D-TARTRATE, ISOLATING 1-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE D-TARTRATE FROM THE MOTHER LIQUOR, AND LIBERATING D-ALPHA-(ALPHA-NAPTHTHYL)ETHYLAMINE AND 1-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE FROM THE RESPECTIVE SALTS OF D-TARTARIC ACID BY REACTION WITH ALKALI.
Claim 2
Independent Claim
69 words
A METHOD OF RESOLVING RACEMIC ALPHA-(ALPHA-NAPHTHYL) ETHYLAMINE INTO ITS OPTICALLY ACTIVE ISOMERS WHICH COMPRISES DISSOLVING DL-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE AND D-TARTARIC ACID IN WARM, SUBSTANTIALLY ANHYDROUS METHANOL, COOLING SAID SOLUTION TO A TEMPERATURE NOT LOWER THAN ABOUT 55*C. TO CAUSE THE PRECIPITATION OF DALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE D-TARTRATE, SEPARATING SAID D-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE D-TARTRATE, ISOLATING 1-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE D-TARTRATE FROM THE MOTHER LIQUOR, AND LIBERATING D-ALPHA-(ALPHA-NAPTHTHYL)ETHYLAMINE AND 1-ALPHA-(ALPHA-NAPHTHYL)ETHYLAMINE FROM THE RESPECTIVE SALTS OF D-TARTARIC ACID BY REACTION WITH ALKALI.
References Cited (Backward Citations)
US2820827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |