US3577266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superficially porous chromatographic packing with sulfonated fluoropolymer coating
Assignee: EIDP Inc
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Filing: 1969-01-13
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Granted: 1971-05-04
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Expires: 1989-01-13
Abstract
Abstract A COATING OF A POLYMER OF THE COMPOUND CF2=CF-O-CF2-CF(-CF3)-O-CF2-CF2-SO3H ON A SUPPORT OF SUPERFICIALLY POROUS SILICEOUS BEADS SERVES AS A SORPTIVELY ACTIVE, CHEMICALLY STABLE CHROMATOGRAPHIC PACKING MATERIAL. SUCH CHROMATOGRAPHIC PACKING PERMITS HIGHLY SELECTIVE, HIGH-SPEED CATIONIC EXCHANGE SEPARATIONS OF A WIDE VARIETY OF MIXTURES.
Inventors
- 👤 Joseph J Kirkland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:55
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/286; B01J2/00; B01J2/006; B01J20/282; B01J20/30; B01J20/32; B01J20/3231; B01J20/3289; B01J20/3291; B01J20/3295; B01J39/00; B01J39/26; G; G01; G01N; G01N30/00; G01N30/02; G01N30/50; G01N30/56; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |