Patent US3344913A successfully refreshed from Google Patents.
US2527366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of amino acids
Assignee: Dow Chemical Co
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Filing: 1946-11-07
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Granted: 1950-10-24
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Expires: 1966-11-07
Abstract
No abstract record available.
Inventors
- 👤 John E Livak
- 👤 Edgar C Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:07
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/18; C07D209/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
IN A METHOD WHEREIN A HYDANTION IS HYDROLYZED TO FORM A CORRESPONDING ALPHA-AMINO MONOCARBOXYLATE, THE STEPS WHICH CONSIST IN ACCOMPLISHING THE HYDROLYSIS OF THE HYDANTOIN BY HEATING THE SAME TOGETHER WITH AQUEOUS BARIUM HYDROXIDE AT A SUPERATMOSPHERIC PRESSURE AS GREAT AS THE AUTOGENOUS PRESSURE TO TEMPERATURES ABOVE 115*C., THEREAFTER PRECIPITATING THE BARIUM AS A WATER-INSOLUBLE BARIUM SALT TO LEAVE THE RESULTANT ALPHA-AMINO MONOCARBOXYLIC ACID COMPOUND DISSOLVED IN THE LIQUOR, REMOVING THE PRECIPITATE, CRYSTALLIZING THE ALPHA-AMINO MONOCARBOXYLIC ACID COMPOUND FROM THE LIQUOR, AND WASHING ANY IMPURE CRYSTALLINE ALPHA-AMINO MONOCARBOXYLIC ACID PRODUCT WITH A LIQUID MONOHYDRIC ALIPHATIC ALCOHOL TO REMOVE THE IMPURITIES.
Claim 2
Dependent Claim
100 words
IN A METHOD WHEREIN A HYDANTION IS HYDROLYZED TO FORM A CORRESPONDING ALPHA-AMINO MONOCARBOXYLATE, THE STEPS WHICH CONSIST IN ACCOMPLISHING THE HYDROLYSIS OF THE HYDANTOIN BY HEATING THE SAME TOGETHER WITH AQUEOUS BARIUM HYDROXIDE AT A SUPERATMOSPHERIC PRESSURE AS GREAT AS THE AUTOGENOUS PRESSURE TO TEMPERATURES ABOVE 115*C., THEREAFTER PRECIPITATING THE BARIUM AS A WATER-INSOLUBLE BARIUM SALT TO LEAVE THE RESULTANT ALPHA-AMINO MONOCARBOXYLIC ACID COMPOUND DISSOLVED IN THE LIQUOR, REMOVING THE PRECIPITATE, CRYSTALLIZING THE ALPHA-AMINO MONOCARBOXYLIC ACID COMPOUND FROM THE LIQUOR, AND WASHING ANY IMPURE CRYSTALLINE ALPHA-AMINO MONOCARBOXYLIC ACID PRODUCT WITH A LIQUID MONOHYDRIC ALIPHATIC ALCOHOL TO REMOVE THE IMPURITIES.
Claim 3
Dependent Claim
82 words
IN A METHOD OF MAKING TRYPTOPHANE, THE STEPS OF HEATING, AT AN AUTOGENOUS SUPERATMOSPHERIC PRESSURE AND IN THE SUBSTANTIAL ABSENCE OF AIR, ONE MOLECULAR EQUIVALENT OF 5-(3-INDOLYLMETHYL) HYDANBTOIN TOGETHER WITH AN AQUEOUS SOLUTION OF AT LEAST 1.5 MOLECULAR EQUIVALENTS OF BARIUM HYDROXIDE TO TEMPERATURES BETWEEN 115* AND 210*C., THEREAFTER PRECIPITATING THE BARIUM AS A WATER-INSOULBLE BARIUM SALT TO LEAVE AN ALKALI METAL SALT OF THE TRYPTOPHANE PRODUCT DISSOLVED IN THE LIQUOR, SEPARATING THE PRECIPITATE AND ACIDIFYING THE LIQUOR TO PRECIPITATE TRYPTOPHANE THEREFROM.
Claim 4
Dependent Claim
82 words
IN A METHOD OF MAKING TRYPTOPHANE, THE STEPS OF HEATING, AT AN AUTOGENOUS SUPERATMOSPHERIC PRESSURE AND IN THE SUBSTANTIAL ABSENCE OF AIR, ONE MOLECULAR EQUIVALENT OF 5-(3-INDOLYLMETHYL) HYDANBTOIN TOGETHER WITH AN AQUEOUS SOLUTION OF AT LEAST 1.5 MOLECULAR EQUIVALENTS OF BARIUM HYDROXIDE TO TEMPERATURES BETWEEN 115* AND 210*C., THEREAFTER PRECIPITATING THE BARIUM AS A WATER-INSOULBLE BARIUM SALT TO LEAVE AN ALKALI METAL SALT OF THE TRYPTOPHANE PRODUCT DISSOLVED IN THE LIQUOR, SEPARATING THE PRECIPITATE AND ACIDIFYING THE LIQUOR TO PRECIPITATE TRYPTOPHANE THEREFROM.
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) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |