US4031305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polygalactomannan ether compositions
Assignee: Stein Hall and Co Inc
•
Filing: 1975-11-17
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Granted: 1977-06-21
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Expires: 1995-11-17
Abstract
Abstract This invention provides novel sulfohydroxypropyl ethers of polygalactomannans having a degree of substitution between about 0.01 and 3, and further provides a process for producing sulfohydroxypropyl ethers of polygalactomannan gums by contacting solid polygalactomannan gum with 3-halo-2-hydroxypropanesulfonic acid and alkali metal hydroxide or ammonium hydroxide under alkaline conditions in an aqueous solution of water-miscible solvent.
Inventors
- 👤 Ronald N. DeMartino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:07
CPC Classifications
C; C08; C08B; C08B37/00; C08B37/006; C08B37/0087; C08B37/0093; C08B37/0096; Y; Y10; Y10S; Y10S507/00; Y10S507/922; Y10S516/00; Y10S516/01; Y10S516/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
Sulfo-2-hydroxypropyl ethers of guar gum and the alkali metal and ammonium salts thereof having a degree of substitution between about 0.01 and 3.0.
Claim 2
Dependent Claim
23 words
Sulfo-2-hydroxypropyl ethers of guar gum and the alkali metal and ammonium salts thereof having a degree of substitution between about 0.01 and 3.0.
Claim 3
Dependent Claim
24 words
Sulfo-2-hydroxypropyl ethers of locust bean gum and the alkali metal and ammonium salts thereof having a degree of substitution between about 0.01 and 3.0.
Claim 4
Dependent Claim
24 words
Sulfo-2-hydroxypropyl ethers of locust bean gum and the alkali metal and ammonium salts thereof having a degree of substitution between about 0.01 and 3.0.
Claim 5
Dependent Claim
23 words
Sulfo-2-hydroxypropyl ethers of polygalactomannan gum and the alkali metal and ammonium salts thereof having a degree of substitution between about 0.01 and 3.0.
Claim 6
Dependent Claim
23 words
Sulfo-2-hydroxypropyl ethers of polygalactomannan gum and the alkali metal and ammonium salts thereof having a degree of substitution between about 0.01 and 3.0.
References Cited (Backward Citations)
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Cited
US3622564A
Cited
US3632804A
Cited
US3686164A
Cited
US3808200A
Cited
US3912713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |