US3647684A
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US
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Adding cationic material to silicic acid sorbent chromatographic sheet for improved performance
Assignee: Dexter Corp
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Filing: 1968-04-17
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Granted: 1972-03-07
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Expires: 1988-04-17
Abstract
Abstract A CHROMATOGRAPHIC MEDIUM EXHIBITING THE HIGH RESOLUTION OF THIN LAYER CROMATOGRAPHY BUT SUBSTANTIALLY GREATER CHROMATOGRAPHIC CAPACITY TAKES THE FORM OF A SELF-SUPPORTING, FLEXIBLE SHEET STRUCTURE COMPRISING A MAJOR PROPORTION, OR ABOUT 50% TO 90% BY WEIGHT, OF A CHROMATOGRAPHIC ADSORBENT, SUCH AS SILICIC ACID, UNIFORMLY AND HOMOGENEOUSLY DISPERSED WITH A MINOR PROPORTION OF STRUCTURALLY STABILIZING INORGANIC FIBERS SUCH AS GLASS FIBERS DISPOSED IN A RANDOMLY ORIENTED NETWORK AND ABOUT 0.01% TO ABOUT 1.5% BY WEIGHT OF A CATIONIC MATERIAL SUCH AS CATIONIC STARCH.
Inventors
- 👤 Earl W Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:49
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/22; B01J20/24; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28014; B01J20/28028; B01J20/28033; B01J20/281; B01J20/282; B01J20/283; B01J20/285; B01J2220/00; B01J2220/40; B01J2220/46; B01J2220/48; B01J2220/4812; B01J2220/4825; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 0
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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) | 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 |