US3822203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic techniques providing variable-selectivity stationary phase
Assignee: Schneider Electric Systems USA Inc
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Filing: 1972-10-10
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Granted: 1974-07-02
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Expires: 1992-10-10
Abstract
Abstract TECHINIQUES FOR OBTAINING SUBSTANTIALLY CHANGES IN THE SPECIFICITY OF A CHROMATOGRAPHIC SEPARATION COLUMN BY CHANGING THE TEMPERATURE OF THE SORBENT MATERIAL. IN A DISCLOSED ILLUSTRATION, THE SORBENT COMPRISES A SOLID SOLUTION OF TWO SUBSTANCES HAVING A RELATIVELY BROAD TRAWMELT REGION, THE SUBSTANCES FURTHER BEING SELECTED TO PROCESS DIFFERENT DEGREES OF SELECTIVITY TOWARD VARIOUS CLASS OF SOLUTES. THE TECHINIQUE CAN BE USED TO OBTAIN OPTIMIZED SEPARATION OF COMPONENTS AND TO PROVIDE A BASIS FOR PERMITTING IDENTIFICATION OF COMPONENTS.
Inventors
- 👤 R Annino
- 👤 Crea P Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:26
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/52; G01N30/54
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) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |