Patent US3580843A successfully refreshed from Google Patents.
US3580843A
Expired / Lapsed
US
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Chromatographic medium and method
Assignee: Monsanto Research Corp
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Filing: 1970-07-27
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Granted: 1971-05-25
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Expires: 1990-07-27
Abstract
Abstract AN IMPROVEMENT IN A CHROMATOGRAPHIC COLUMN IN WHICH THE CHROMATOGRAPHIC MEDIUM OR SUPPORT IS AN OPEN-PORE POLYUREATHANE STRUCTURE FILLING THE COLUMN WALL-TO-WALL; THE PROCESS FOR FILLING THE COLUMN WITH A HOMOGENEOUS PRECURSOR SOLUTION; AND THE PROCESS FOR USING THE COLUMN TO SEPARATE ORGANIC COMPOUNDS SUCH AS HYDROCARBONS AND METAL DERIVATIVES OF DIKETONES.
Inventors
- 👤 Ival O Salyer
- 👤 Robert T Jefferson
- 👤 William D Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:51
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28042; B01J20/28045; B01J20/22; B01J20/281; B01J20/282; B01J20/285; B01J20/292; B01J20/30; B01J20/32; B01J20/3202; B01J20/3206; B01J20/3208; B01J20/3212; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/3272; B01J2220/00; 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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |