US3778393A
Expired / Lapsed
US
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Gels for use in gel chromatographic procedures and processes for producing the same
Assignee: PWA Papierwerke Waldhof Aschaffenburg AG
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Filing: 1971-01-25
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Granted: 1973-12-11
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Expires: 1991-01-25
Abstract
Abstract GELS HAVING COVALENT BUILT IN NUCLEIC ACID GROUPS AS AN INTEGRAL PART OF THE GEL STRUCTURE, IN WHICH AT LEAST A NUCLEOBASE IS PRESENT WHICH PROVIDES THE FREE FUNCTIONAL GROUPS REQUIRED FOR BASE COUPLING OR EXCHANGE AND METHOD OF MAKING AND USING SUCH GELS.
Inventors
- 👤 G Greber
- 👤 H Schott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:21
CPC Classifications
C; C07; C07H; C07H19/00; C07H19/02; C07H19/04; C07H19/06; B; B01; B01J; B01J20/00; B01J20/22; C07H21/00; G; G01; G01N; G01N33/00; G01N33/48
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |