Patent US5683396A successfully refreshed from Google Patents.
Patent US2535117A successfully refreshed from Google Patents.
US2535117A
Expired / Lapsed
US
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Process for recovery of glutamic acid and other values from steffen waste water
Assignee: Great Western Sugar Co
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Filing: 1948-06-15
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Granted: 1950-12-26
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Expires: 1968-06-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur N Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:09
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/04; C12P13/14; C07; C07C; C07C227/00; C07C227/38; C07C227/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN A PROCESS FOR THE RECOVERY OF GLUTAMIC ACID FROM STEFFEN WASTE WATER, WHEREIN STEFFEN WASTE WATER IS MAINTAINED AT ELEVATED TEMPERATURES TO HYDROLYSE PYRROLIDONE CARBOXYLIC ACID THEREIN AND THEN IS CARBONATED AND FILTERED TO REMOVE CALCIUM COMPOUNDS, THE STEPS WHICH COMPRISE CONCENTRATING THE CARBONATED HYDROLYSED WASTE WATER UNTIL A PARTIALLY CONCENTRATED LIQUID HAVING A DRY SUBSTANACE CONTENT OF FROM 20% TO 40% IS OBTAINED, ACIDIFYING THE PARTIALLY CONCENTRATED WASTE WATER TO A PH OF ABOUT 3.2, REMOVING THE SOLIDS THAT PRECIPITATE, AND FURTHER CONCENTRATING THE ACIDIFIED PARTIALLY CONCENTRATED LIQUOR UNTIL ITS DRY SUBSTANCE CONTENT IS ABOUT 67 TO 70% TO PRECIPITATE A FURTER CROP OF SOLIDS AND OBTAIN A LIQUOR CONTAINING THE RECOVERABLE GLUTAMIC ACID WITH LITTLE CONTAMINATION BY HUMIC SUBSTANCES.
Claim 2
Dependent Claim
122 words
IN A PROCESS FOR THE RECOVERY OF GLUTAMIC ACID FROM STEFFEN WASTE WATER, WHEREIN STEFFEN WASTE WATER IS MAINTAINED AT ELEVATED TEMPERATURES TO HYDROLYSE PYRROLIDONE CARBOXYLIC ACID THEREIN AND THEN IS CARBONATED AND FILTERED TO REMOVE CALCIUM COMPOUNDS, THE STEPS WHICH COMPRISE CONCENTRATING THE CARBONATED HYDROLYSED WASTE WATER UNTIL A PARTIALLY CONCENTRATED LIQUID HAVING A DRY SUBSTANACE CONTENT OF FROM 20% TO 40% IS OBTAINED, ACIDIFYING THE PARTIALLY CONCENTRATED WASTE WATER TO A PH OF ABOUT 3.2, REMOVING THE SOLIDS THAT PRECIPITATE, AND FURTHER CONCENTRATING THE ACIDIFIED PARTIALLY CONCENTRATED LIQUOR UNTIL ITS DRY SUBSTANCE CONTENT IS ABOUT 67 TO 70% TO PRECIPITATE A FURTER CROP OF SOLIDS AND OBTAIN A LIQUOR CONTAINING THE RECOVERABLE GLUTAMIC ACID WITH LITTLE CONTAMINATION BY HUMIC SUBSTANCES.
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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |