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US5104547A
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Separating materials for chromatography comprising cyclodextrin chemically bonded to a support via a carbamic acid group
Assignee: Merck Patent GmbH
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Filing: 1991-03-06
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Granted: 1992-04-14
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Expires: 2011-03-06
Abstract
Abstract The invention relates to a separating material for chromatography in which cyclodextrin is bonded to a support via a carbamic acid group.
Inventors
- 👤 Karin Cabrera
- 👤 Gisela Schwinn
- 👤 Dieter Lubda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:32
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/286; B01J20/02; B01J20/10; B01J20/103; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28057; B01J20/28061; B01J20/28078; B01J20/29; B01J20/30; B01J20/3092; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3214; B01J20/3217; B01J20/3219; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3246; B01J20/3257; B01J20/3259; B01J20/3263; C; C07; C07B; C07B57/00; B01J2220/00; B01J2220/50; B01J2220/54; B01J2220/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
19 words
A separating material for chromatography, which comprises a support having cyclodextrin chemically bonded thereto via a carbamic acid group.
Claim 2
Dependent Claim
19 words
A separating material for chromatography, which comprises a support having cyclodextrin chemically bonded thereto via a carbamic acid group.
Claim 3
Dependent Claim
24 words
A separating material as in claim 1, wherein the carbamic acid group is bound to an aminosilane group which is bound to the support.
Claim 4
Dependent Claim
103 words
A separating material as in claim 2, wherein the support is silica gel, Al 2 O 3 , TiO 2 , ZrO 2 or a synthetic polymer carrying free NH 2 groups and the amino silane is of the formula RSiX 3 wherein R is alkyl, aryl or aralkyl having up to 20 carbon atoms, in each case containing at least one amino group, wherein one or more non-adjacent CH 2 groups can be substituted by NH- groups, and X is alkoxy, aralkoxy or alkyl having up to 20 carbon atoms, with the proviso that at least one X is alkoxy or aralkoxy.
Claim 5
Dependent Claim
33 words
A chromatographic separation process for the separation of substance mixtures, the improvement comprising utilizing a separating material for chromatography which comprises a support having cyclodextrin chemically bonded thereto via a carbamic acid group.
Claim 6
Dependent Claim
33 words
A chromatographic separation process for the separation of substance mixtures, the improvement comprising utilizing a separating material for chromatography which comprises a support having cyclodextrin chemically bonded thereto via a carbamic acid group.
Claim 7
Dependent Claim
25 words
A chromatographic separation process for the separation of enantiomers, the improvement comprising utilizing silica gel having cyclodextrin chemically bonded thereto via a carbamic acid group.
Claim 8
Dependent Claim
25 words
A chromatographic separation process for the separation of enantiomers, the improvement comprising utilizing silica gel having cyclodextrin chemically bonded thereto via a carbamic acid group.
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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) | 1995-04-14 | 1995-10-14 | 1996-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-14 | 1999-10-14 | 2000-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-14 | 2003-10-14 | 2004-04-14 | $7700.00 | Window Closed / Lapsed |