Patent US3201455A successfully refreshed from Google Patents.
US3201455A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolution of dl-menthyl hydrogen phthalate with 1-(alpha-naphthyl)-ethylamine
Assignee: Chemetron Corp
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Filing: 1962-01-02
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Granted: 1965-08-17
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Expires: 1982-01-02
Abstract
No abstract record available.
Inventors
- 👤 Edward L Russell
- 👤 Kenneth A Hanover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:39
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/34; C07B; C07B57/00; C07B2200/00; C07B2200/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
METHOD OF OBTAINING AN OPTICALLY ACTIVE ISOMER OF DL-MENTHYL HYDROGEN PHTHALATE WHICH COMPRISES: REACTING DL-MENTHYL HYDROGEN PHTHALATE WITH AN OPTICALLY ACTIVE ISOMER OF 1-(A-NAPHTHYL)-ETHYLAMINE IN AN ORGANIC SOLVENT COMPRISING A MAJOR AMOUNT OF AN ALIPHATIC HYDROCARBON LIQUID AND A MINOR AMOUNT OF AN AROMATIC HYDROCARBON LIQUID, WHEREBY AN INSOLUBLE SALT OF AN OPTICALLY ACTIVE ISOMER OF SAID DL-MENTHYL HYDROGEN PHTHALATE AND SAID OPTICALLY ACTIVE ISOMER OF 1-(A-NAPHTHYL)ETHYLAMINE IS PRODUCED, SEPARATING SAID INSOLUBLE SALT FROM THE MOTHER LIQUOR, REACTING SAID INSOLUBLE SALT WITH AQUEOUS ACID TO REMOVE THE 1-(A-NAPHTHYL)-ETHYLAMINE THEREFROM, AND SEPARATING THE OPTICALLY ACTIVE ISOMER OF DLMENTHYL HYDROGEN PHTHALATE FROM THE AQUEOUS ACID.
Claim 2
Dependent Claim
103 words
METHOD OF OBTAINING AN OPTICALLY ACTIVE ISOMER OF DL-MENTHYL HYDROGEN PHTHALATE WHICH COMPRISES: REACTING DL-MENTHYL HYDROGEN PHTHALATE WITH AN OPTICALLY ACTIVE ISOMER OF 1-(A-NAPHTHYL)-ETHYLAMINE IN AN ORGANIC SOLVENT COMPRISING A MAJOR AMOUNT OF AN ALIPHATIC HYDROCARBON LIQUID AND A MINOR AMOUNT OF AN AROMATIC HYDROCARBON LIQUID, WHEREBY AN INSOLUBLE SALT OF AN OPTICALLY ACTIVE ISOMER OF SAID DL-MENTHYL HYDROGEN PHTHALATE AND SAID OPTICALLY ACTIVE ISOMER OF 1-(A-NAPHTHYL)ETHYLAMINE IS PRODUCED, SEPARATING SAID INSOLUBLE SALT FROM THE MOTHER LIQUOR, REACTING SAID INSOLUBLE SALT WITH AQUEOUS ACID TO REMOVE THE 1-(A-NAPHTHYL)-ETHYLAMINE THEREFROM, AND SEPARATING THE OPTICALLY ACTIVE ISOMER OF DLMENTHYL HYDROGEN PHTHALATE FROM THE AQUEOUS ACID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |