US2515320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for the production of n-acylated amino-substituted carboxylic acids
Assignee: Heyden Chemical Corp
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Filing: 1946-11-06
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Granted: 1950-07-18
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Expires: 1966-11-06
Abstract
No abstract record available.
Inventors
- 👤 Sokol Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:33
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/45
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A PROCESS FOR THE PRODUCTION OF AN NACETYLATED AMINO-SUBSTITUTED CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF N-ACETYL GLYCINE, VALINE, LEUCINE, ISOLEUCINE, PHENYLALANINE, METHIONINE, THREONINE, LYSINE, ORNITHINE, ARGININE, NORLEUCINE, ASPARTIC ACID, CITRULLINE, PROLINE, TRYPTOPHANE, HISTIDINE, THYROXINE, CYSTEINE, CYSTINE, GLUTAMIC ACID, SERINE, TYROSINE, ANTHRANILIC ACID AND PARA-AMINOBENZOIC ACID, WHICH COMPRISES THE REACTION OF A MIXED ANHYDRIDE OF THE NACETYL AMINO-SUBSTITUTED CARBOXYLIC ACID AND ACETIC ACID WITH SUCH AN AMOUNT OF SUBSTANTIALLY ANHYDROUS ACETIC ACID THAT AT LEAST APPROXIMATELY 4 MOLECULAR PROPORTIONS OF ACETIC ACID ARE PRESENT FOR EACH MOLECULAR PROPORTION OF THE MIXED ANHYDRIDE, WHEREBY THE N-ACETYL AMINOSUBSTITUTED CARBOXYLIC ACID AND ACETIC ANHYDRIDE ARE FORMED, AND SUBSEQUENTLY RECOVERING THE RESULTING N-ACETYL AMINO-SUBSTITUTED CARBOXYLIC ACID.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE PRODUCTION OF AN NACETYLATED AMINO-SUBSTITUTED CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF N-ACETYL GLYCINE, VALINE, LEUCINE, ISOLEUCINE, PHENYLALANINE, METHIONINE, THREONINE, LYSINE, ORNITHINE, ARGININE, NORLEUCINE, ASPARTIC ACID, CITRULLINE, PROLINE, TRYPTOPHANE, HISTIDINE, THYROXINE, CYSTEINE, CYSTINE, GLUTAMIC ACID, SERINE, TYROSINE, ANTHRANILIC ACID AND PARA-AMINOBENZOIC ACID, WHICH COMPRISES THE REACTION OF A MIXED ANHYDRIDE OF THE NACETYL AMINO-SUBSTITUTED CARBOXYLIC ACID AND ACETIC ACID WITH SUCH AN AMOUNT OF SUBSTANTIALLY ANHYDROUS ACETIC ACID THAT AT LEAST APPROXIMATELY 4 MOLECULAR PROPORTIONS OF ACETIC ACID ARE PRESENT FOR EACH MOLECULAR PROPORTION OF THE MIXED ANHYDRIDE, WHEREBY THE N-ACETYL AMINOSUBSTITUTED CARBOXYLIC ACID AND ACETIC ANHYDRIDE ARE FORMED, AND SUBSEQUENTLY RECOVERING THE RESULTING N-ACETYL AMINO-SUBSTITUTED CARBOXYLIC ACID.
Claim 3
Dependent Claim
57 words
A PROCESS FOR THE PRODUCTION OF N-ACETYLANTHRANILIC ACID WHICH COMPRISES, THE REACTION OF N-ACETYLANTHRANILIC-ACETIC ANHYDRIDE WITH SUBSTANTIALLY ANHYDROUS ACETIC ACID IN SUCH AMOUNT THAT AT LEAST APPROXIMATELY 4 MOLECULAR PROPORTIONS OF ACETIC ACID ARE PRESENT FOR EACH MOLECULAR PROPORTION OF N-ACETYLANTHRANILIC-ACETIC ANHYDRIDE, WHEREBY N-ACETYLANTHRANILE ACID AND ACETIC ANHYDRIDE ARE FORMED, AND SUBSEQUENTLY RECOVERING THE RESULTING N-ACETYLANTHRANILIC ACID.
Claim 4
Dependent Claim
57 words
A PROCESS FOR THE PRODUCTION OF N-ACETYLANTHRANILIC ACID WHICH COMPRISES, THE REACTION OF N-ACETYLANTHRANILIC-ACETIC ANHYDRIDE WITH SUBSTANTIALLY ANHYDROUS ACETIC ACID IN SUCH AMOUNT THAT AT LEAST APPROXIMATELY 4 MOLECULAR PROPORTIONS OF ACETIC ACID ARE PRESENT FOR EACH MOLECULAR PROPORTION OF N-ACETYLANTHRANILIC-ACETIC ANHYDRIDE, WHEREBY N-ACETYLANTHRANILE ACID AND ACETIC ANHYDRIDE ARE FORMED, AND SUBSEQUENTLY RECOVERING THE RESULTING N-ACETYLANTHRANILIC ACID.
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) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |