Patent US2549456A successfully refreshed from Google Patents.
US2549456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of glutamic acid
Assignee: EIDP Inc
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Filing: 1948-04-05
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Granted: 1951-04-17
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Expires: 1968-04-05
Abstract
No abstract record available.
Inventors
- 👤 William F Gresham
- 👤 Carl E Schweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:23
CPC Classifications
C; C07; C07C; C07C227/00; C07C227/38; C07C227/40; C07C227/02; C07C229/00; C07C229/02; C07C229/04; C07C229/06; C07C229/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE MANUFACTURE OF MONOSODIUM GLUTAMATE THE PROCESS WHICH COMPRISES REACTING THE CYANHYDRIN OF METHYL 4-OXOBUTYRATE WITH AMMONIA AT A REACTION TEMPERATURE NOT IN EXCESS OF 150* C., UNDER A PRESSURE OF AT LEAST 5 ATMOSPHERES, WHEREBY GLUTAMIC ACID MONOMETHYL ESTER NITRILE IS PRODUCED, REMOVING EXCESS AMMONIA FROM THE RESULTING MIXTURE, SUBJECTING THE RESIDUE TO HYDROLYSIS WITH AQUEOUS SODIUM HYDROXIDE, THE QUANTITY OF SODIUM HYDROXIDE BEING STOICHIOMETRICALLY SUFFICIENT TO FORM DISODIUM GLUTAMATE, EVAPORATING THE RESULTING MIXTURE TO DRYNESS, WHEREBY A RESIDUE OF DISODIUM GLUTAMATE IS OBTAINED, ADMIXING THE SAID RESIDUE WITH SUFFICIENT HYDROCHLORIC ACID TO CONVERT THE DISODIU, TO MONOSODIUM GLUTAMATE, AND DRYING THE RESULTING MIXTURE CONTAINING MONOSODIUM GLUTAMATE.
Claim 2
Dependent Claim
109 words
IN THE MANUFACTURE OF MONOSODIUM GLUTAMATE THE PROCESS WHICH COMPRISES REACTING THE CYANHYDRIN OF METHYL 4-OXOBUTYRATE WITH AMMONIA AT A REACTION TEMPERATURE NOT IN EXCESS OF 150* C., UNDER A PRESSURE OF AT LEAST 5 ATMOSPHERES, WHEREBY GLUTAMIC ACID MONOMETHYL ESTER NITRILE IS PRODUCED, REMOVING EXCESS AMMONIA FROM THE RESULTING MIXTURE, SUBJECTING THE RESIDUE TO HYDROLYSIS WITH AQUEOUS SODIUM HYDROXIDE, THE QUANTITY OF SODIUM HYDROXIDE BEING STOICHIOMETRICALLY SUFFICIENT TO FORM DISODIUM GLUTAMATE, EVAPORATING THE RESULTING MIXTURE TO DRYNESS, WHEREBY A RESIDUE OF DISODIUM GLUTAMATE IS OBTAINED, ADMIXING THE SAID RESIDUE WITH SUFFICIENT HYDROCHLORIC ACID TO CONVERT THE DISODIU, TO MONOSODIUM GLUTAMATE, AND DRYING THE RESULTING MIXTURE CONTAINING MONOSODIUM GLUTAMATE.
References Cited (Backward Citations)
US2437600A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |