US3798206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing alpha-dipeptide esters of l-aspartic acid
Assignee: Ajinomoto Co Inc
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Filing: 1971-01-21
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Granted: 1974-03-19
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Expires: 1991-01-21
Abstract
Abstract A-DIPEPTIDE LOWER ALKYL ESTERS OF L-ASPARTIC ACID OF THE FORMULA HOOC-CH2-CH(-NH2)-CO-NH-CH(-CH2-X)-COO-R WHEREIN R IS LOWER ALKYL, X IS PHENYL OR P-HYDROXYPHENYL AND THE STEROCHEMICAL CONFIGURATION IS L-L, ARE PREPARED BY REACTING A STRONG ACID SALT OF L-ASPARTIC ANHYDRIDE WITH A LOWER ALKYL ESTER OF L-PHENYLALANINE OR L-TYROSINE.
Inventors
- 👤 K Toi
- 👤 N Sato
- 👤 T Yamatani
- 👤 Y Ariyoshi
- 👤 N Uchiyama
- 👤 N Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:10
CPC Classifications
A; A23; A23L; A23L27/00; A23L27/30; A23L27/31; A23L27/32; Y; Y10; Y10S; Y10S530/00; Y10S530/801
Claims Analysis
Total Claims: 0
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |