Patent US3458568A successfully refreshed from Google Patents.
US3458568A
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Process for preparing an optically inactive amino acid from an optically active amino acid
Assignee: Toagosei Co Ltd
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Filing: 1966-02-14
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Granted: 1969-07-29
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Expires: 1986-02-14
Abstract
No abstract record available.
Inventors
- 👤 Takahisa Ogasawara
- 👤 Hidemaro Tatemichi
- 👤 Hiroo Ito
- 👤 Shigenari Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:35
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/36; C07C279/00; C07C279/04; C07C279/10; C07C323/00; C07C323/23; C07C323/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A PROCESS OF RACEMIZING AN OPTICALLY ACTIVE AMINO ACID SELECTED FROM THE GROUP CONSISTING OF GLUTAMIC ACID, ALANINE, LYSINE, ASPARAGINIC ACID, METHIONINE, PHENYL ALANINE, VALINE AND ARGININE AND SALTS THEREOF, WHICH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF SAID OPTICALLY ACTIVE AMINO ACID A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALPHA-KETOCARBOXYLIC ACIS AND WATER-SOLUBLE SALTS THEREOF AS WELL AS A WATER-SOLUBLE COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, IRON, COPPER, CHROMIUM AND BISMUTH IN SUCH AMOUNTS THAT THE PROPORTION OF THE ALPHA-KETOCARBOXYLIC ACID ADDED IS 0.01 TO 0.4 MOL. PER MOL. OF THE OPTICALLY ACTIVE AMINO ACID IN THE SOLUTION AND THAT THE PROPORTION OF THE WATER-SOLUBLE COMPOUND OF METAL IS 0.1 TO 1 MOL. PER MOL. OF THE ALPHA-KETOCARBOXYLIC ACID ADDED; AND HEATING THE SOLUTION AT A TEMPERATURE OF 50 TO 100*C. FOR A PERIOD OF TIME OF 10 TO 400 MINUTES WHILE THE PH OF THE REACTION MIXTURE IS KEPT WITHIN A RANGE OF 3 TO 10.
Claim 2
Dependent Claim
164 words
A PROCESS OF RACEMIZING AN OPTICALLY ACTIVE AMINO ACID SELECTED FROM THE GROUP CONSISTING OF GLUTAMIC ACID, ALANINE, LYSINE, ASPARAGINIC ACID, METHIONINE, PHENYL ALANINE, VALINE AND ARGININE AND SALTS THEREOF, WHICH COMPRISES ADDING TO AN AQUEOUS SOLUTION OF SAID OPTICALLY ACTIVE AMINO ACID A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALPHA-KETOCARBOXYLIC ACIS AND WATER-SOLUBLE SALTS THEREOF AS WELL AS A WATER-SOLUBLE COMPOUND OF A METAL SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, IRON, COPPER, CHROMIUM AND BISMUTH IN SUCH AMOUNTS THAT THE PROPORTION OF THE ALPHA-KETOCARBOXYLIC ACID ADDED IS 0.01 TO 0.4 MOL. PER MOL. OF THE OPTICALLY ACTIVE AMINO ACID IN THE SOLUTION AND THAT THE PROPORTION OF THE WATER-SOLUBLE COMPOUND OF METAL IS 0.1 TO 1 MOL. PER MOL. OF THE ALPHA-KETOCARBOXYLIC ACID ADDED; AND HEATING THE SOLUTION AT A TEMPERATURE OF 50 TO 100*C. FOR A PERIOD OF TIME OF 10 TO 400 MINUTES WHILE THE PH OF THE REACTION MIXTURE IS KEPT WITHIN A RANGE OF 3 TO 10.
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) | 1972-07-28 | 1973-01-27 | 1973-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-28 | 1977-01-27 | 1977-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-28 | 1981-01-27 | 1981-07-29 | $7700.00 | Window Closed / Lapsed |