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US2617823A
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Isolation of amino acids
Assignee: Primary Products Ingredients Americas LLC
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Filing: 1949-02-16
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Granted: 1952-11-11
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Expires: 1969-02-16
Abstract
No abstract record available.
Inventors
- 👤 Wolff Hans
- 👤 Berger Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:04
CPC Classifications
C; C07; C07C; C07C229/00; C07C229/02; C07C229/34; C07C229/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE METHOD OF OBTAINING A SPARINGLY SOLUBLE ALPHA-AMINO ACID, SELECTED FROM THE GROUP CONSISTING OF 1-CYSTINE, 1-TYROSINE, 1-LEUCINE AND DI-METHIONINE, FROM A SPARINGLY SOLUBLE, AROMATIC SULFONIC ACID SALT THEREOF IN AQUEOUS MIXTURE, WHEREIN THE SULFONIC ACID FORMS A SOLUBLE AMMONIUM SULFONATE, COMPRISING: ADDING AMMONIA TO SAID MIXTURE IN AN AMOUNT SUFFICIENT TO REACT WITH SUBSTANTIALLY ALL OF SAID SALT SO AS TO PRODUCE A PRECIPITATE OF THE SPARINGLY SOLUBLE ALPHA-AMINO ACID AND A SOLUTION CONTAINING THE SOLUBLE AMMONIUM SULFONATE, AND SEPARATING THE PRECIPITATE; SAID 1-CYSTINE SALT BEING P-TOLUENESULFONATE, SAID 1-TYROSINE SALT BEING 2'',4'' -DINITRODIPHENYLETHERP-SULFONATE, SAID 1-LEUCINE SALT BEING SELECTED FROM THE GROUP CONSISTING OF BETA-NAPHTHALENESULFONATE AND P-TOLUENESULFONATE, AND SAID DLMETHIONINE SALT BEING SELECTED FROM THE GROUP CONSISTING OF P-TOLUENE-SULFONATE, O-TOSYL-P-PHENOLSULFONATE AND 2'',4''-DINITRODIPHENYLETHER-PSULFONATE.
Claim 2
Independent Claim
122 words
THE METHOD OF OBTAINING A SPARINGLY SOLUBLE ALPHA-AMINO ACID, SELECTED FROM THE GROUP CONSISTING OF 1-CYSTINE, 1-TYROSINE, 1-LEUCINE AND DI-METHIONINE, FROM A SPARINGLY SOLUBLE, AROMATIC SULFONIC ACID SALT THEREOF IN AQUEOUS MIXTURE, WHEREIN THE SULFONIC ACID FORMS A SOLUBLE AMMONIUM SULFONATE, COMPRISING: ADDING AMMONIA TO SAID MIXTURE IN AN AMOUNT SUFFICIENT TO REACT WITH SUBSTANTIALLY ALL OF SAID SALT SO AS TO PRODUCE A PRECIPITATE OF THE SPARINGLY SOLUBLE ALPHA-AMINO ACID AND A SOLUTION CONTAINING THE SOLUBLE AMMONIUM SULFONATE, AND SEPARATING THE PRECIPITATE; SAID 1-CYSTINE SALT BEING P-TOLUENESULFONATE, SAID 1-TYROSINE SALT BEING 2'',4'' -DINITRODIPHENYLETHERP-SULFONATE, SAID 1-LEUCINE SALT BEING SELECTED FROM THE GROUP CONSISTING OF BETA-NAPHTHALENESULFONATE AND P-TOLUENESULFONATE, AND SAID DLMETHIONINE SALT BEING SELECTED FROM THE GROUP CONSISTING OF P-TOLUENE-SULFONATE, O-TOSYL-P-PHENOLSULFONATE AND 2'',4''-DINITRODIPHENYLETHER-PSULFONATE.
References Cited (Backward Citations)
US2186162A
Cited
US2443391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |