US4818394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating agent
Assignee: Daicel Corp
•
Filing: 1988-01-11
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Granted: 1989-04-04
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Expires: 2008-01-11
Abstract
Abstract A mixture of chemical substances such as optical isomers, geometrical isomers and polymers having different molecular weight ranges is separated to each ingredient by use of a cellulose derivative having an aromatic ring in the chromatographic method.
Inventors
- 👤 Yoshio Okamoto
- 👤 Koichi Hatada
- 👤 Tohru Shibata
- 👤 Ichiro Okamoto
- 👤 Hiroyuki Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:35
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/328; B01J20/22; B01J20/281; B01J20/286; B01J20/29; B01J20/3244; B01J20/3246; B01J20/3248; B01J20/3253; C; C07; C07C; C07C45/00; C07C45/78
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
71 words
A separating agent which comprises a cellulose derivative selected from the group consisting of cellulose tribenzoate and cellulose tribenzoate ring-substituted with alkyl, alkenyl, alkynyl, nitro, halogen, amino, alkyl-substituted amino, cyano, hydroxyl, alkoxy, acyl, thiol, sulfonyl, carboxyl or alkoxy carbonyl, said cellulose derivative being supported on a porous carrier having a particle size of from 1 micron to 10 millimeters and a pore size of from 10 Angstrom units to 100 microns.
Claim 2
Dependent Claim
71 words
A separating agent which comprises a cellulose derivative selected from the group consisting of cellulose tribenzoate and cellulose tribenzoate ring-substituted with alkyl, alkenyl, alkynyl, nitro, halogen, amino, alkyl-substituted amino, cyano, hydroxyl, alkoxy, acyl, thiol, sulfonyl, carboxyl or alkoxy carbonyl, said cellulose derivative being supported on a porous carrier having a particle size of from 1 micron to 10 millimeters and a pore size of from 10 Angstrom units to 100 microns.
Claim 3
Dependent Claim
16 words
A separating agent as claimed in claim 1 in which said cellulose derivative is cellulose tribenzoate.
Claim 4
Dependent Claim
30 words
A separating agent as claimed in claim 1, wherein the amount of said cellulose derivative supported on said carrier is from 1-100 wt.% based on the weight of the carrier.
Claim 5
Dependent Claim
25 words
A separating agent as claimed in claim 1, wherein the ratio of pore size to particle size of said carrier is not larger than 0.1:1.
Claim 6
Dependent Claim
30 words
A separating agent as claimed in claim 1, wherein said carrier is an inorganic substance selected from the group consisting of silica, alumina, magnesia, titanium oxide, glass, silicate and kaolin.
Claim 7
Dependent Claim
25 words
A separating agent as claimed in claim 1, wherein said carrier is an organic substance selected from the group consisting of polystyrene, polyacrylamide and polyacrylate.
Claim 8
Dependent Claim
42 words
A separating agent as claimed in claim 1 in which said cellulose derivative is coated on said carrier and has been prepared by mixing said carrier with a solution of said cellulose derivative in a solvent therefor, and then removing said solvent.
Claim 9
Dependent Claim
16 words
A separating agent as claimed in claim 5, in which said carrier is an inorganic substance.
Claim 10
Dependent Claim
16 words
A separating agent as claimed in claim 8, in which said inorganic substance is silica gel.
Claim 11
Dependent Claim
69 words
A chromatographic isomer separating agent comprising a derivative of cellulose selected from the group consisting of cellulose tribenzoate and cellulose tribenzoate ring-substituted with alkyl, alkenyl, alkynyl, nitro, halogen, amino, alkyl-substituted amino, cyano, hydroxyl, alkoxy, acyl, thiol, sulfonyl, carboxyl or alkoxy carbonyl having a number average degree of polymerization in the range of 5-5000 supported on a solid carrier having a particle size of from 1 micron to 10 millimeters.
Claim 12
Dependent Claim
69 words
A chromatographic isomer separating agent comprising a derivative of cellulose selected from the group consisting of cellulose tribenzoate and cellulose tribenzoate ring-substituted with alkyl, alkenyl, alkynyl, nitro, halogen, amino, alkyl-substituted amino, cyano, hydroxyl, alkoxy, acyl, thiol, sulfonyl, carboxyl or alkoxy carbonyl having a number average degree of polymerization in the range of 5-5000 supported on a solid carrier having a particle size of from 1 micron to 10 millimeters.
Claim 13
Dependent Claim
18 words
A chromagraphic isomer separating agent as claimed in claim 10 in which said cellulose derivative is cellulose tribenzoate.
Claim 14
Dependent Claim
18 words
A chromagraphic isomer separating agent as claimed in claim 8 in which said cellulose derivative is cellulose tris(3-chlorobenzoate).
Claim 15
Dependent Claim
18 words
A chromagraphic isomer separating agent as claimed in claim 8 in which said cellulose derivative is cellulose tris(3,5-dichlorobenzoate).
Claim 16
Dependent Claim
18 words
A chromagraphic isomer separating agent as claimed in claim 8 in which said cellulose derivative is cellulose tris(4-chlorobenzoate).
Claim 17
Dependent Claim
50 words
A chromatographic isomer separating agent as claimed in claim 8, wherein said cellulose derivative is immobilized on solid carrier particles, wherein said carrier particles from 1 μm-10 mm in diameter and the amount of said cellulose derivative supported is from 1-100 wt.% based on the weight of the carrier particles.
Claim 18
Dependent Claim
25 words
A chromatographic isomer separating agent as claimed in claim 15 wherein said carrier particles are porous and have pore diameters of from 10 Å-100 μm.
Claim 19
Dependent Claim
28 words
A chromatographic isomer separating agent as claimed in claim 16, wherein said carrier particles have an approximate pore size to particle size ratio of no greater than 0.1:1.
Claim 20
Dependent Claim
29 words
A chromatographic isomer separating agent as claimed in claim 15, wherein said carrier is an inorganic substance selected from among silica, alumina, magnesia, titanium oxide, glass, silicate and kaolin.
Claim 21
Dependent Claim
16 words
A chromatographic isomer separating agent as claimed in claim 15, wherein said carrier is silica gel.
Claim 22
Dependent Claim
27 words
A chromatographic isomer separating agent as claimed in claim 15, wherein said carrier is an organic substance selected from the group consisting of polystyrene, polyacrylamide and polyacrylate.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |