US3629230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternization with alkylene oxides
Assignee: Cytiva Sweden AB
•
Filing: 1969-09-10
•
Granted: 1971-12-21
•
Expires: 1989-09-10
Abstract
Abstract NOVEL METHOD FOR PRODUCING QUATERNIZATION PRODUCTS OF AMINO GROUP-SUBSTITUTED CELLULOSE AND OF AMINO GROUPSUBSTITUTED HYDROPHILIC, WATER-SWELLABLE AND WATER-INSOLUBLE COPOLYMERIZATES OF POLYHYDROXY COMPOUNDS WITH BIFUNCTIONAL SUBSTANCES. THESE QUATERNIZATION PRODUCTS HAVE A HIGH DEGREE OF QUATERNIZATION, PREFERABLY AMOUNTING TO AT LEAST ABOUT 80 PERCENT. THE NOVEL PRODUCTS ARE PREFERABLY, BUT NOT SOLELY, INTENDED FOR USE IN GRAIN FORM FOR ION-EXCHANGE CHROMATOGRAPHY.
Inventors
- 👤 Bjorn Gunnar Folke Soderqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:57
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |