Patent US2592839A successfully refreshed from Google Patents.
Patent US4892659A successfully refreshed from Google Patents.
US4892659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation agent comprising aliphatic ester of polysaccharide
Assignee: Daicel Corp
•
Filing: 1988-07-27
•
Granted: 1990-01-09
•
Expires: 2008-07-27
Abstract
Abstract A separation agent essentially comprises an aliphatic or aromatic ester of a polysaccharide, except for cellulose acetate and an aromatic ester of cellulose. It is useful for separation of various chemical substances, especially optical resolution of optical isomers.
Inventors
- 👤 Tohru Shibata
- 👤 Hajime Namikoshi
- 👤 Ichiro Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:56
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/282; B01J20/285; B01D; B01D15/00; B01D15/08; B01D15/26; B01D15/38; B01D15/3833; B01D71/00; B01D71/06; B01D71/08; B01D71/12; B01D71/14; B01J20/02; B01J20/06; B01J20/08; B01J20/10; B01J20/103; B01J20/12; B01J20/22; B01J20/24; B01J20/26; B01J20/262; B01J20/28; B01J20/28002; B01J20/28004; B01J20/28054; B01J20/28078; B01J20/286; 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; B01J20/3268; B01J20/3272; B01J20/3274; C; C07; C07B; C07B57/00; C07B63/00; C07C; C07C45/00; C07C45/78; C07C45/786; B01J2220/00; B01J2220/40; B01J2220/48; B01J2220/4812; B01J2220/4825; B01J2220/485; B01J2220/50; B01J2220/54; B01J2220/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
38 words
In a method for chromatographically separating an optical isomer from a racemic mixture thereof, wherein the mixture is contacted with a separation agent under chromatographic separation conditions, the improvement which comprises: employing amylose triacetate as the separation agent.
Claim 2
Dependent Claim
38 words
In a method for chromatographically separating an optical isomer from a racemic mixture thereof, wherein the mixture is contacted with a separation agent under chromatographic separation conditions, the improvement which comprises: employing amylose triacetate as the separation agent.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, in which said amylose triacetate is formed by reacting amylose with acetic acid.
Claim 4
Dependent Claim
16 words
The method of claim 1, wherein said amylose triacetate is in the form of a powder.
Claim 5
Dependent Claim
18 words
The method of claim 3, wherein the particle size of said powder is from 1 to 300 μm.
Claim 6
Dependent Claim
30 words
A method as claimed in claim 1, in which said mixture is conducted through a chromatographic column or layer to effect separation and resolution of the components of said mixture.
Claim 7
Independent Claim
73 words
A method for chromatographically separating an optical isomer from a racemic mixture thereof which comprises contacting said mixture, under liquid chromatographic separation conditions, with a chromatographic separation material consisting essentially of inorganic carrier particles having a particle size of from 1 μm to 10 mm and coated with from 1 to 100% by weight of resolving agent, based on the weight of said carrier particles, said resolving agent consisting essentially of amylose triacetate.
Claim 8
Independent Claim
73 words
A method for chromatographically separating an optical isomer from a racemic mixture thereof which comprises contacting said mixture, under liquid chromatographic separation conditions, with a chromatographic separation material consisting essentially of inorganic carrier particles having a particle size of from 1 μm to 10 mm and coated with from 1 to 100% by weight of resolving agent, based on the weight of said carrier particles, said resolving agent consisting essentially of amylose triacetate.
Claim 9
Dependent Claim
27 words
A method as claimed in claim 6 in which said inorganic carrier is porous and has an average pore diameter of from 10 Å to 100 μm.
Claim 10
Dependent Claim
27 words
A method as claimed in claim 6 in which said inorganic carrier is selected from the group consisting of silica, alumina, magnesia, titanium oxide, glass and kaolin.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 6 in which said inorganic carrier particles are silica beads which have been surface treated with an organosilane compound to improve their affinity for the resolving agent.
References Cited (Backward Citations)
US4076930A
Cited
US3875044A
Cited
US3953366A
Cited
US4118336A
Cited
US4123381A
Cited
US4094832A
Cited
US4127503A
Cited
US4308254A
Cited
US4280925A
Cited
US4390691A
Cited
US4461892A
Cited
US4472498A
Cited
US4529788A
Cited
DE3246417A1
Cited
US4524199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |