US2789983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of cycloserine
Assignee: Commercial Solvents Corp
•
Filing: 1954-08-03
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Granted: 1957-04-23
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Expires: 1974-08-03
Abstract
No abstract record available.
Inventors
- 👤 Roger L Harned
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:09
CPC Classifications
C; C07; C07D; C07D261/00; C07D261/02; C07D261/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR RECOVERY OF CYCLOSERINE FROM AN IMPURE AQUEOUS SOLUTION THEREOF WHICH COMPRISES ADDING A WATER-SOLUBLE SALT OF A METAL CAPABLE OF FORMING A WATER-INSOLUBLE SALT OF CYCLOSERINE TO AN IMPURE AQUEOUS SOLUTION OF CYCLOSERINE AT A PH RANGING FROM 5.5-9.0, REMOVING THE PRECIPITATED METAL SALT OF CYCLOSERINE FROM THE SUPERNATANT, SLURRYING THE WATER-INSOLUBLE METAL SALT OF CYCLOSERINE WITH WATER, ADDING TO THE SLURRY AN ACID HAVING AN ANION CAPABLE OF PREFERENTIALLY FORMING A WATER-INSOLUBLE SALT WITH THE METAL CATION OF THE WATERINSOLUBLE METAL SALT OF CYCLOSERINE, REMOVING THE PRECIPITAED WATER-INSOLUBLE METAL SALT, AND RECOVERING CYCLOSERINE FROM THE PURIFIED AQUEOUS SOLUTION THEREOF.
Claim 2
Dependent Claim
103 words
A PROCESS FOR RECOVERY OF CYCLOSERINE FROM AN IMPURE AQUEOUS SOLUTION THEREOF WHICH COMPRISES ADDING A WATER-SOLUBLE SALT OF A METAL CAPABLE OF FORMING A WATER-INSOLUBLE SALT OF CYCLOSERINE TO AN IMPURE AQUEOUS SOLUTION OF CYCLOSERINE AT A PH RANGING FROM 5.5-9.0, REMOVING THE PRECIPITATED METAL SALT OF CYCLOSERINE FROM THE SUPERNATANT, SLURRYING THE WATER-INSOLUBLE METAL SALT OF CYCLOSERINE WITH WATER, ADDING TO THE SLURRY AN ACID HAVING AN ANION CAPABLE OF PREFERENTIALLY FORMING A WATER-INSOLUBLE SALT WITH THE METAL CATION OF THE WATERINSOLUBLE METAL SALT OF CYCLOSERINE, REMOVING THE PRECIPITAED WATER-INSOLUBLE METAL SALT, AND RECOVERING CYCLOSERINE FROM THE PURIFIED AQUEOUS SOLUTION THEREOF.
References Cited (Backward Citations)
US2443485A
Cited
GB371550A
Cited
US2501014A
Cited
US2571674A
Cited
US2546297A
Cited
US2640842A
Cited
US2667441A
Cited
GB715362A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |