Patent US5017290A successfully refreshed from Google Patents.
US5017290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation agent comprising acyl- or carbamoyl-substituted polysaccharide
Assignee: Daicel Corp
•
Filing: 1989-08-11
•
Granted: 1991-05-21
•
Expires: 2009-08-11
Abstract
Abstract Separation of a chemical substance is effected by treating a mixture thereof with a polysaccharide having a substituent for hydroxyl group an acyl group of the formula (1) or a carbamoyl group of the formula (2): ##STR1## wherein R represents an atomic group having a nucleus comprising a conjugated π-bond system in which the number of bonds interposed between an atom contained therein and bonded with the carbonyl or amino group and an atom contained in the π-bond system and most distant from said atom is at least 5 even in the shortest route.
Inventors
- 👤 Hajime Namikoshi
- 👤 Tohru Shibata
- 👤 Ichiro Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:49
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/78; C07C45/786; C08; C08B; C08B15/00; C08B15/05; C08B15/06; C08B31/00; C08B37/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
24 words
A method of separating a chemical substance from a mixture containing the same, which comprises the step of treating said mixture with amylose tricannamate.
Claim 2
Independent Claim
24 words
A method of separating a chemical substance from a mixture containing the same, which comprises the step of treating said mixture with amylose tricannamate.
Claim 3
Dependent Claim
17 words
A method as claimed in claim 1, in which said mixture is a mixture of optical isomers.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, in which the method is conducted through a chromatographic column or layer.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 1, wherein said polysaccharide derivative is supported on a porous particulate carrier in an amount of from 1-100 wt.% based on said carrier.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 4, wherein said carrier is from 1-300 μm in size.
Claim 7
Dependent Claim
17 words
A method as claimed in claim 4, wherein the pore size of said carrier is from 50-50,000Å.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 1, wherein said derivative is supported on a porous particulate carrier in an amount preferably from 5-50 wt.% based on said carrier.
Claim 9
Independent Claim
40 words
A method effective for separating chemical substances from mixtures thereof and for separating optical isomers from mixtures thereof, which comprises the step of contacting said mixture, under conditions effective for chromatographic separation, with a chromatographic separating agent comprising amylose tricinnamate.
Claim 10
Independent Claim
40 words
A method effective for separating chemical substances from mixtures thereof and for separating optical isomers from mixtures thereof, which comprises the step of contacting said mixture, under conditions effective for chromatographic separation, with a chromatographic separating agent comprising amylose tricinnamate.
Claim 11
Dependent Claim
15 words
The method of claim 8, wherein the chromatographic separating agent is supported on silica beads.
References Cited (Backward Citations)
US3416993A
Cited
US3597350A
Cited
US3960720A
Cited
US4016149A
Cited
US4330440A
Cited
US4335226A
Cited
US4111838A
Cited
US4322310A
Cited
US4431544A
Cited
US4431546A
Cited
US4512898A
Cited
US4565877A
Cited
US4522724A
Cited
US4767571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |