US3376694A
Expired / Lapsed
US
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Method and apparatus for gel permeation chromatography
Assignee: Dow Chemical Co
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Filing: 1966-07-22
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Granted: 1968-04-09
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Expires: 1986-07-22
Abstract
No abstract record available.
Inventors
- 👤 Ii Elbert Guy Owens
- 👤 Harold H Gill
- 👤 William E Hatton
- 👤 John G Cobler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:29
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/84; G01N30/60; G01N30/6052; G01N2030/8411; G01N2030/8417; G01N30/62; G01N30/64; G01N30/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A GEL PERMEATION CHROMATOGRAPHIC METHOD WHEREIN A HIGH MOLECULAR WEIGHT MATERIAL TO BE ANALYZED IS DISSOLVED IN A SOLVENT TO FORM A SOLUTION, THE SOLUTION IS PASSED THROUGH AN ELONGATED BODY OF MICROPOROUS POLYMER WHICH IS INSOLUBLE IN THE SOLUTION, AND EFFLUENT REMOVED FROM THE ELONGATE BODY AND THE QUANTITY OF MATERIAL PRESENT WITHIN SUCCESSIVE PORTIONS OF THE EFFLUENT DETERMINED, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AN ELONGATE BODY OF A MICROPOROUS POLYMER HAVING A DIAMETER FROM ABOUT 0.01 TO ABOUT 0.125 INCH, DEPOSITING EFFLUENT FROM THE BODY UPON A PERFORATE INERT METAL SUPPORT CAPABLE OF RETAINING EFFLUENT, EVAPORATING AT LEAST A MAJOR PORTION OF SOLVENT IN THE EFFLUENT FROM THE SUPPORT, MOVING A PORTION OF THE SUPPORT UPON WHICH THE EFFLUENT IS DEPOSITED INTO A FLAME OF A FLAME IONIZATION DETECTOR AND RECORDING THE RESPONSE OF THE DETECTOR.
Claim 2
Dependent Claim
139 words
IN A GEL PERMEATION CHROMATOGRAPHIC METHOD WHEREIN A HIGH MOLECULAR WEIGHT MATERIAL TO BE ANALYZED IS DISSOLVED IN A SOLVENT TO FORM A SOLUTION, THE SOLUTION IS PASSED THROUGH AN ELONGATED BODY OF MICROPOROUS POLYMER WHICH IS INSOLUBLE IN THE SOLUTION, AND EFFLUENT REMOVED FROM THE ELONGATE BODY AND THE QUANTITY OF MATERIAL PRESENT WITHIN SUCCESSIVE PORTIONS OF THE EFFLUENT DETERMINED, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AN ELONGATE BODY OF A MICROPOROUS POLYMER HAVING A DIAMETER FROM ABOUT 0.01 TO ABOUT 0.125 INCH, DEPOSITING EFFLUENT FROM THE BODY UPON A PERFORATE INERT METAL SUPPORT CAPABLE OF RETAINING EFFLUENT, EVAPORATING AT LEAST A MAJOR PORTION OF SOLVENT IN THE EFFLUENT FROM THE SUPPORT, MOVING A PORTION OF THE SUPPORT UPON WHICH THE EFFLUENT IS DEPOSITED INTO A FLAME OF A FLAME IONIZATION DETECTOR AND RECORDING THE RESPONSE OF THE DETECTOR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |