US4291156A
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Polysaccharide S-53 and bacterial fermentation process for its preparation
Assignee: Merck and Co Inc
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Filing: 1979-02-28
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Granted: 1981-09-22
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Expires: 1999-02-28
Abstract
Abstract A novel polysaccharide S-53, having a composition of 18-19% uronic acid, 4.8% pyruvate, and 7% acetyl as the O-glycosidically linked ester; and the remainder neutral sugar, 51% glucose and 49% fucose. This polysaccharide is produced by the strain of Klebsiella pneumoniae, ATCC No. 31488 growing in a suitable fermentation medium.
Inventors
- 👤 Kenneth S. Kang
- 👤 George T. Veeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:09
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/04; C09; C09D; C09D7/00; C09D7/40; C09D7/43; C08; C08L; C08L5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
Heteropolysaccharide S-53, containing 4.8% pyruvate, 7% acetyl, and 18-19% uronic acid; the rest being neutral sugar, 51% glucose and 49% fucose; said heteropolysaccharide being incompatible with methylene chloride dye and compatible with milling green dye, being substantially insoluble in water-miscible alcohols, such as methanol, ethanol and isopropanol, and ketones like acetone, and soluble in water and having an infrared spectra characterized by peaks at 3400 cm -1 , 2950 cm -1 , 1720 cm -1 , and 1600 cm -1 .
Claim 2
Dependent Claim
81 words
Heteropolysaccharide S-53, containing 4.8% pyruvate, 7% acetyl, and 18-19% uronic acid; the rest being neutral sugar, 51% glucose and 49% fucose; said heteropolysaccharide being incompatible with methylene chloride dye and compatible with milling green dye, being substantially insoluble in water-miscible alcohols, such as methanol, ethanol and isopropanol, and ketones like acetone, and soluble in water and having an infrared spectra characterized by peaks at 3400 cm -1 , 2950 cm -1 , 1720 cm -1 , and 1600 cm -1 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |