US3558433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purification of chymopapain
Assignee: FLINT LABORATORIES Inc A CORP OF
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Filing: 1967-11-07
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Granted: 1971-01-26
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Expires: 1987-11-07
Abstract
Abstract PROCESS FOR PURIFYING CHYMOPAPAIN BY CHROMATOGRAPHY OF AN AQUEOUS EXTRACT OF CRUDE CHYMOPAPAIN OR PAPAYA LATEX WITH CARBOXYMETHYL SUBSTGITUTED CROSS-LINKED DEXTRAN COPOLYMER EQUILIBRATED WITH AQUEOUS BUFFER SOLUTION FOLLOWED BY ELUTING WITH AQUEOUS BUFFER SOLUTION HAVING ABOUT THE SAME PH AS, BUT GREATER IONIC STRENGTH THAN THE BUFFER USED FOR EQUILIBRATING THE CHROMATOGRAPHIC COLUMN.
Inventors
- 👤 Ivan J Stern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/48; C12N9/50; C12N9/63; A; A61; A61K; A61K38/00; A61K38/16; A61K38/43; A61K38/46; A61K38/48; A61K38/4873; B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/16; B01D15/166; B01D15/26; B01D15/34; C12Y; C12Y304/00; C12Y304/22; C12Y304/22006; Y; Y10; Y10S; Y10S435/00; Y10S435/814; Y10S435/815
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |