US4075405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
β-1,3-Glucan derivatives
Assignee: Takeda Pharmaceutical Co Ltd
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Filing: 1975-11-26
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Granted: 1978-02-21
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Expires: 1995-11-26
Abstract
Abstract β-1,3-Glucan derivatives, which are produced by reacting a water-insoluble β-1,3-glucan with a cyanogen halide, are a useful water-insoluble carrier of high reactivity for the production of water-insoluble enzymes and of carrier-ligand products suitable for affinity chromatography.
Inventors
- 👤 Takeshi Takahashi
- 👤 Yoshio Yamazaki
- 👤 Koichi Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:58
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/0006; C08B37/0024; B; B01; B01J; B01J20/00; B01J20/281; B01J20/286; Y; Y10; Y10S; Y10S435/00; Y10S435/8215; Y10S435/822; Y10S435/823; Y10S435/829; Y10S435/91
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A beta-1,3-glucan derivative, which is produced by reacting water-insoluble beta-1,3-glucan produced by microorganisms belonging to the genus Alcaligenes, the genus Agrobacterium or Poria cocos, with cyanogen halide in the presence of water and with the addition of an alkali in an amount such that the pH of the reaction system is sufficiently increased to prevent dissolution of said water-insoluble beta-1,3-glucan, said increase being in the range of about 0.2 to 0.5 pH unit/minute.
Claim 2
Dependent Claim
73 words
A beta-1,3-glucan derivative, which is produced by reacting water-insoluble beta-1,3-glucan produced by microorganisms belonging to the genus Alcaligenes, the genus Agrobacterium or Poria cocos, with cyanogen halide in the presence of water and with the addition of an alkali in an amount such that the pH of the reaction system is sufficiently increased to prevent dissolution of said water-insoluble beta-1,3-glucan, said increase being in the range of about 0.2 to 0.5 pH unit/minute.
Claim 3
Dependent Claim
17 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is in the form of powder.
Claim 4
Dependent Claim
17 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is in the form of fiber.
Claim 5
Dependent Claim
17 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is in the form of film.
Claim 6
Dependent Claim
17 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is in the form of bead.
Claim 7
Dependent Claim
21 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is produced by a microorganism belonging to the genus Alcaligenes.
Claim 8
Dependent Claim
21 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is produced by a microorganism belonging to the genus Agrobacterium.
Claim 9
Dependent Claim
20 words
A beta-1,3-glucan derivative according to claim 1, wherein the water-insoluble beta-1,3-glucan is produced by a microorganism belonging to Poria cocos.
References Cited (Backward Citations)
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US3645852A
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US3759896A
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US3822250A
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US3899480A
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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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |