US2667441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the recovery of neomycin
Assignee: Commercial Solvents Corp
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Filing: 1950-08-02
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Granted: 1954-01-26
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Expires: 1970-08-02
Abstract
No abstract record available.
Inventors
- 👤 Urs F Nager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:31
CPC Classifications
C; C07; C07H; C07H15/00; C07H15/20; C07H15/22; C07H15/222; C07H15/226; C07H15/228; C07H15/232
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR RECOVERING NOEMYCIN FROM AQUEOUS SOLUTIONS THEREOF WHICH COMPRISES ADSORBING THE NEOMYCIN ON A CARBOXYLIC ACID, CATION-TYPE, ION-EXCHANGE RESIN HAVING A PH WITHIN THE RANGE OF FROM ABOUT 4 TO 8, ELUTING THE NEOMYCIN FROM THE RESIN WITH AN AQUEOUS SOLUTION OF A NITROGEN BASE HAVING A DISSOCIATION CONSTANT RANGING FROM ABOUT 5.6X40-4 TO 3.83X10-10 AND SELECTED FROM A CLASS CONSISTING OF ORGANIC AMINES AND AMMONIA, AND RECOVERING THE NEOMYCIN FROM THE ELUATE.
Claim 2
Dependent Claim
75 words
A PROCESS FOR RECOVERING NOEMYCIN FROM AQUEOUS SOLUTIONS THEREOF WHICH COMPRISES ADSORBING THE NEOMYCIN ON A CARBOXYLIC ACID, CATION-TYPE, ION-EXCHANGE RESIN HAVING A PH WITHIN THE RANGE OF FROM ABOUT 4 TO 8, ELUTING THE NEOMYCIN FROM THE RESIN WITH AN AQUEOUS SOLUTION OF A NITROGEN BASE HAVING A DISSOCIATION CONSTANT RANGING FROM ABOUT 5.6X40-4 TO 3.83X10-10 AND SELECTED FROM A CLASS CONSISTING OF ORGANIC AMINES AND AMMONIA, AND RECOVERING THE NEOMYCIN FROM THE ELUATE.
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) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |