Patent US4502478A successfully refreshed from Google Patents.
US4076930A
Expired / Lapsed
US
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Polysaccharide polyols
Assignee: Individual
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Filing: 1971-01-29
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Granted: 1978-02-28
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Expires: 1991-01-29
Abstract
Abstract Hydroxyalkyl ethers of hydroxyalkoxy polysaccharides are prepared by reacting the corresponding polysaccharide first with an epoxide in an aqueous alkaline medium, and then with an epoxide in the presence of a Lewis acid catalyst in a nonaqueous, nonalcoholic organic solvent. The resulting products are hydrophobic and strongly lipophilic, and are outstanding substrates for liquid-gel chromatography.
Inventors
- 👤 James Ellingboe
- 👤 Ernst Holger Nystrom
- 👤 Jan Bertil Sjovall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:55
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/08; C08B31/00; C08B31/08; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A solid derivative of a polysaccharide containing more than 6 pentose or hexose groups, said derivative containing at least one radical of the formula ##STR2## a. wherein said A is sulfur, and b. said R 1 and R 2 are each hydrogen alkyl, aryl, alkylene, or alkoxyalkyl, and c. wherein said R 3 and R 4 are each hydrogen, alkyl, aryl, alkylene, or alkoxy alkyl, i. said R 1 and R 2 containing not more than 6 carbon atoms, ii. said R 3 and R 4 containing not more than 28 carbon atoms.
Claim 2
Dependent Claim
93 words
A solid derivative of a polysaccharide containing more than 6 pentose or hexose groups, said derivative containing at least one radical of the formula ##STR2## a. wherein said A is sulfur, and b. said R 1 and R 2 are each hydrogen alkyl, aryl, alkylene, or alkoxyalkyl, and c. wherein said R 3 and R 4 are each hydrogen, alkyl, aryl, alkylene, or alkoxy alkyl, i. said R 1 and R 2 containing not more than 6 carbon atoms, ii. said R 3 and R 4 containing not more than 28 carbon atoms.
Claim 3
Dependent Claim
102 words
A solid derivative of a polysaccharide containing more than 6 pentose or hexose groups, said derivative containing at least one radical of the formula ##STR3## a. wherein said A is oxygen or sulfur, and b. said R 1 and R 2 are each hydrogen alkyl, aryl, alkylene, or alkoxyalkyl, and c. wherein one of said R 3 and R 4 is hydrogen and the other a halogen substituted alkyl, aryl, alkylene, or alkoxy alkyl, i. said R 1 and R 2 containing not more than 6 carbon atoms, ii. said R 3 and R 4 containing not more than 28 carbon atoms.
Claim 4
Dependent Claim
102 words
A solid derivative of a polysaccharide containing more than 6 pentose or hexose groups, said derivative containing at least one radical of the formula ##STR3## a. wherein said A is oxygen or sulfur, and b. said R 1 and R 2 are each hydrogen alkyl, aryl, alkylene, or alkoxyalkyl, and c. wherein one of said R 3 and R 4 is hydrogen and the other a halogen substituted alkyl, aryl, alkylene, or alkoxy alkyl, i. said R 1 and R 2 containing not more than 6 carbon atoms, ii. said R 3 and R 4 containing not more than 28 carbon atoms.
Claim 5
Dependent Claim
19 words
Polysaccharide of claim 2, wherein the other of said R 3 and R 4 is a halogen substituted alkyl.
Claim 6
Dependent Claim
12 words
Polysaccharide of claim 3, wherein the halogen-substituted radical is chloromethyl or bromomethyl.
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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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |