US3692669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for micro dry column chromatography
Assignee: California Institute of Technology
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Filing: 1970-08-10
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Granted: 1972-09-19
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Expires: 1990-08-10
Abstract
Abstract MICRO-SIZED DRY CHROMATOGRAPHIC COLUMNS AR EPREPARED BY PLUGGING AT LEAST ONE END OF A GLASS CAPILLARY TUBE WITH A MATERIAL IMPERVIOUS TO THE PARTICLES OF ADSORBENT BUT, PERVIOUS TO THE CHROMATOGRAPHIC SOLVENT, FILLING THE TUBE WITH ADSOBRENT, COMPACTING THE ADSORBENT AND PLUGGING THE OTHER END OF THE COLUMN. AN ANALYSIS IS CONDUCTED BY IMBIBING SAMPLE ONTO THE SOLVENT PERVIOUS PLUG, SOLVENT DEVELOPMENT THROUGH SAID PLUG, SEPARATING THE BANDS BY BREAKING THE TUBE INTO SEGMENTS AND ANALYZING THE BANDS.
Inventors
- 👤 Albert J Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:18
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6052; G01N30/6082; G01N30/6073; G01N30/6078; G01N30/50; G01N30/56; G01N2030/562
Claims Analysis
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |