Patent US3749709A successfully refreshed from Google Patents.
US3749709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of reduced pyridine coenzymes
Assignee: Roche Diagnostics GmbH
•
Filing: 1969-03-11
•
Granted: 1973-07-31
•
Expires: 1989-03-11
Abstract
Abstract PROCESS FOR THE CHROMATOGRAPHIC PURIFICATION OF REDUCED PYRIDINE COENZYMES WHICH COMPRISES UTILIZING COLUMNS CHARGED WITH WEAKLY BASIC ANION EXCHANGE RESINS WHICH ARE NOT PRESENT IN THE HYDROXYL FORM AND CARRYING OUT THE ELUTION WITH AN ALKALINE ELUTION AGENT HAVING A PH GREATER THAN 7.5.
Inventors
- 👤 Hochstetter M Nelboeck
- 👤 K Beaucamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:36
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |