US3347752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microbiological cleavage process for resolving racemic alpha-methyl-beta-(3, 4,-dihydroxyphenyl)-alanine
Assignee: Merck and Co Inc
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Filing: 1965-03-26
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Granted: 1967-10-17
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Expires: 1985-03-26
Abstract
No abstract record available.
Inventors
- 👤 Rauenbusch Erich
- 👤 Frommer Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:06
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/911; Y10S435/925; Y10S435/933; Y10S435/945
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR RESOLVING RACEMIC A-METHYL-B-(3,4-DIHYDROXYPHENYL)-ALANINE INTO ITS OPTICAL ANTIPODES WHICH COMPRISES CAUSING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF STEREO-SELECTIVE DESTERIFYING FUNGI AND EXTRACTS PREPARED THEREFROM TO ACT IN AQUEOUS MEDIUM ON A DERIVATIVE OF THE FORMULA: 1-(R"-OOC-C(-NH2)(-CH3)-CH2-),3-(R''-O-),4-(R-O-)-BENZENE WHEREIN R AND R'' ARE EACH SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL OF 1 TO 4 CABON ATOMS, R AND R'' LINKED TOGETHER TO FORM A SINGLE ALKYLENE CHAIN, ACYL OF 1 TO 18 CARBON ATOMS, ACYL OF 1 TO 18 CARBON ATOMS WHICH IS CARBOXY SUBSTITUTED AND ACYL OF 1 TO 18 CARBON ATOMS WHICH IS CARBOALKOXY SUBSTITUTED, AND R" IS SELECTED FROM THE GROUP CONSISTING OF STRAIGHT AND BRANCHED ALKYL CHAINS OF 1 TO 6 CARBON ATOMS.
Claim 2
Dependent Claim
121 words
A PROCESS FOR RESOLVING RACEMIC A-METHYL-B-(3,4-DIHYDROXYPHENYL)-ALANINE INTO ITS OPTICAL ANTIPODES WHICH COMPRISES CAUSING A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF STEREO-SELECTIVE DESTERIFYING FUNGI AND EXTRACTS PREPARED THEREFROM TO ACT IN AQUEOUS MEDIUM ON A DERIVATIVE OF THE FORMULA: 1-(R"-OOC-C(-NH2)(-CH3)-CH2-),3-(R''-O-),4-(R-O-)-BENZENE WHEREIN R AND R'' ARE EACH SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL OF 1 TO 4 CABON ATOMS, R AND R'' LINKED TOGETHER TO FORM A SINGLE ALKYLENE CHAIN, ACYL OF 1 TO 18 CARBON ATOMS, ACYL OF 1 TO 18 CARBON ATOMS WHICH IS CARBOXY SUBSTITUTED AND ACYL OF 1 TO 18 CARBON ATOMS WHICH IS CARBOALKOXY SUBSTITUTED, AND R" IS SELECTED FROM THE GROUP CONSISTING OF STRAIGHT AND BRANCHED ALKYL CHAINS OF 1 TO 6 CARBON ATOMS.
References Cited (Backward Citations)
US3256156A
Cited
US3290225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |