US4647657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heteropolysaccharide - NW-01
Assignee: Texaco Inc
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Filing: 1985-09-12
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Granted: 1987-03-03
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Expires: 2005-09-12
Abstract
Abstract The new heteropolysaccharide NW-01 prepared by the fermentation of a Flavobacterium species ATCC 53201 has valuable properties as a viscosity and mobility cotrol agent in aqueous systems and useful in preparing oil well drilling fluids. Its chemical composition consists of glucose, arabinose and galactose in a 4.8:3.3:1 molar ratio.
Inventors
- 👤 Chiu-Chi Wan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:15
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
The compound Heteropolysaccharide-NW- 01, said heteropolysaccharide consisting of glucose, arabinose and galactose in a 4.8:3.3:1 molar ratio and said heteropolysaccharide being soluble in water.
Claim 2
Dependent Claim
24 words
The compound Heteropolysaccharide-NW- 01, said heteropolysaccharide consisting of glucose, arabinose and galactose in a 4.8:3.3:1 molar ratio and said heteropolysaccharide being soluble in water.
References Cited (Backward Citations)
US4304906A
Cited
US4536496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |