Patent US2517601A successfully refreshed from Google Patents.
US2517601A
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Crystallization of glutamic acid derived from hydrolysates
Assignee: International Minerals and Chemical Corp
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Filing: 1948-05-15
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Granted: 1950-08-08
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Expires: 1968-05-15
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Shafor
- 👤 Frehn H Catterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:27
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; C12P13/14; C07; C07C; C07C227/00; C07C227/38; C07C227/40; C07C227/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A PROCESS OF CRYSTALLIZING GLUTAMIC ACID, WHICH COMPRISES MAINTAINING A CIRCULATING SLURRY STREAM OF GLUTAMIC ACID CRYSTALS AND MOTHER LIQUOR AT A PH OF BETWEEN ABOUT 3.1 AND ABOUT 3.3, SAID STREAM CONTAINING A MIXING ZONE AND AT LEAST ONE HOLD-UP ZONE, ADDING TO THE MIXING ZONE A SOUTION OF GLUTAMIC ACID PREPARED FROM A HYDROLYSATE OF MATERIAL CONTAINING COMBINED GLUTAMIC ACID AND WHICH UPON ADJUSTMENT TO SAID PH WIL CRYSTALLIZE OUT GLUTAMIC ACID, MAINTAINING THE SAID PH OF THE CIRCULATING SLURRY STREAM BY THE ADDITION TO THE MIXING ZONE OF A MINERAL ACID NON-OXIDIZING UNDER THE CONDITIONS OBTAINING AND WITHDRAWING A PORTION OF THE CIRCULATING SLURRY STREAM.
Claim 2
Dependent Claim
108 words
A PROCESS OF CRYSTALLIZING GLUTAMIC ACID, WHICH COMPRISES MAINTAINING A CIRCULATING SLURRY STREAM OF GLUTAMIC ACID CRYSTALS AND MOTHER LIQUOR AT A PH OF BETWEEN ABOUT 3.1 AND ABOUT 3.3, SAID STREAM CONTAINING A MIXING ZONE AND AT LEAST ONE HOLD-UP ZONE, ADDING TO THE MIXING ZONE A SOUTION OF GLUTAMIC ACID PREPARED FROM A HYDROLYSATE OF MATERIAL CONTAINING COMBINED GLUTAMIC ACID AND WHICH UPON ADJUSTMENT TO SAID PH WIL CRYSTALLIZE OUT GLUTAMIC ACID, MAINTAINING THE SAID PH OF THE CIRCULATING SLURRY STREAM BY THE ADDITION TO THE MIXING ZONE OF A MINERAL ACID NON-OXIDIZING UNDER THE CONDITIONS OBTAINING AND WITHDRAWING A PORTION OF THE CIRCULATING SLURRY STREAM.
References Cited (Backward Citations)
US1990769A
Cited
US1947563A
Cited
US1940428A
Cited
US2214115A
Cited
US2178210A
Cited
US2194302A
Cited
US2373342A
Cited
US2433219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |