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US3220164A
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Recirculation chromatography
Assignee: Applied Biosystems Inc
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Filing: 1962-07-18
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Granted: 1965-11-30
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Expires: 1982-07-18
Abstract
No abstract record available.
Inventors
- 👤 Marcel J E Golay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:52
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; G01N30/46; G01N30/468; G01N30/40; G01N30/44; G01N30/04; G01N30/16; G01N30/20; G01N2030/202; G01N2030/382; G01N2030/385; G01N2030/445
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
A METHOD OF CHROMATOGRAPHIC SEPARATION COMPRISING: (A) PASSING A MIXTURE OF FLUID COMPONENTS SEQUENTIALLY AND REPEATEDLY THROUGH A PLURALITY OF CHROMATOGRAPHIC SEPARATING COLUMNS; (B) REMOVING COMPONENTS AHEAD OF A PRESELECTED PORTION OF SAID MIXTURE IF THERE ARE COMPONENTS PRESENT IN SAID MIXTURE WHICH ARE AHEAD OF SAID PRESELECTED PORTION; (C) BACKFLUSHING IN A PREVIOUSLY USED COLUMN COMPONENTS BEHIND SAID PRESELECTED PORTION AND REMOVING SAID COMPONENTS BEHIND SAID PRESELECTED PORTION; AND (D) PASSING SAID PRESELECTED PORTION THROUGH SAID PREVIOUSLY USED COLUMN IN THE SAME DIRECTION AS THE DIRECTION OF BACKFLUSH.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |