US2999090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of oxidized hydroxyalkyl starch
Assignee: Unilever Bestfoods North America
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Filing: 1957-05-10
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Granted: 1961-09-05
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:11
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR PRODUCING A STARCH DERIVATIVE WHICH COMPRISES HYDROXALYLATING STARCH UNDER NON-GELATINIZING CONDITIONS IN AQUEOUS SLURRY WITH LIME AS CATALYST, ADJUSTING THE PH OF THE SLURRY OF 2.0 AND SEPARATING THE RESULTANT HYDROZYALKYL STARCH THEREFROM, RESLURRING THE HYDROXY-ALKYL STARCH IN WATER AND ADJUSTING THE PH OF THE RESULTING SLURRY TO AT LEAST 8.0 AND OXIDIZING THE HYDROZYALKYL STARCH WITH AN OXIDIZING AGENT WHICH RELEASES CHLORINE AT AN OXIDATION-REDUCTION POTENTIAL OF AT LEAST 700 MILLIVOLTS, MAINTAINIG A PH OF AT LEAST 8.0 DURING THE OXIDATION REACTION AND RECOVERING THE OXIDIZED HYDROXYALKYL STARCH.
Claim 2
Dependent Claim
92 words
A PROCESS FOR PRODUCING A STARCH DERIVATIVE WHICH COMPRISES HYDROXALYLATING STARCH UNDER NON-GELATINIZING CONDITIONS IN AQUEOUS SLURRY WITH LIME AS CATALYST, ADJUSTING THE PH OF THE SLURRY OF 2.0 AND SEPARATING THE RESULTANT HYDROZYALKYL STARCH THEREFROM, RESLURRING THE HYDROXY-ALKYL STARCH IN WATER AND ADJUSTING THE PH OF THE RESULTING SLURRY TO AT LEAST 8.0 AND OXIDIZING THE HYDROZYALKYL STARCH WITH AN OXIDIZING AGENT WHICH RELEASES CHLORINE AT AN OXIDATION-REDUCTION POTENTIAL OF AT LEAST 700 MILLIVOLTS, MAINTAINIG A PH OF AT LEAST 8.0 DURING THE OXIDATION REACTION AND RECOVERING THE OXIDIZED HYDROXYALKYL STARCH.
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) | 1964-09-04 | 1965-03-06 | 1965-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-04 | 1969-03-06 | 1969-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-04 | 1973-03-06 | 1973-09-05 | $7700.00 | Window Closed / Lapsed |