US3647633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the continuous phased culturing of cells
Assignee: Canadian Patents and Development Ltd
•
Filing: 1968-08-16
•
Granted: 1972-03-07
•
Expires: 1988-08-16
Abstract
Abstract A METHOD OF IMPROVING OR MAINTAINING THE PHASING OF CELLS IN A CELL CULTURE BY GROWING THE CELL CULTURE AT A PREDETERMINED RATE IN A NUTRIENT MEDIUM WHICH PRESENT IN AN AMOUNT SUFFICIENT ONLY FOR THE CELLS IN THE CELL CULTURE TO COMPLETE THEIR CYCLE AND AT THE DOUBLING TIME FO THE CELL CULTURE I.E. THE TIME WHEN FROM 70 TO 90% OF THE CELLS ARE ON THE POINT OF DIVIDING, ADDING FURTHER CELL CULTURE MEDIUM TO AT LEAST A PORTION OF THE CELL CULTURE SUCH THAT CELLS HAVE SUFFICIENT MEDIUM FOR COMPLETION OF A FURTHER CYCLE.
Inventors
- 👤 Peter S S Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:45
CPC Classifications
C; C12; C12M; C12M29/00; C12M29/10; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/886; Y10S435/911; Y10S435/94
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |