Patent US3176007A successfully refreshed from Google Patents.
US3176007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process employing chelating agents to prepare sludge-free hydroxyalkyl starch ethers
Assignee: Primary Products Ingredients Americas LLC
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Filing: 1961-06-15
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Granted: 1965-03-30
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Expires: 1981-06-15
Abstract
No abstract record available.
Inventors
- 👤 John V Tuschhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:21
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN THE PROCESS OF PREPARING HYDROXALKYL STARCH ETHER, WHICH COMPRISES REACTING STARCH WITH A VICINAL EPOXY COMPOUND IN THE PRESENCE OF A WATER-SOLUBLE ALKALINE CATALYST, THE IMPROVEMENT WHICH COMPRISES REACTING SAID STARCH WITH THE VICINAL EPOXY COMPOUND AT AN ALKALINE PH IN THE PRESENCE OF A SMALL BUT EFFECTIVE CONCENTRATION OF UP TO 5% BY WEIGHT OF A WATER-SOLUBLE CHELATING COMPOUND WHICH FORMS A STABLE CHELATE WITH IRON OVER THE PH RANGE OF 7 TO 9, AND THEN NEUTRALIZING THE REACTANTS.
Claim 2
Dependent Claim
81 words
IN THE PROCESS OF PREPARING HYDROXALKYL STARCH ETHER, WHICH COMPRISES REACTING STARCH WITH A VICINAL EPOXY COMPOUND IN THE PRESENCE OF A WATER-SOLUBLE ALKALINE CATALYST, THE IMPROVEMENT WHICH COMPRISES REACTING SAID STARCH WITH THE VICINAL EPOXY COMPOUND AT AN ALKALINE PH IN THE PRESENCE OF A SMALL BUT EFFECTIVE CONCENTRATION OF UP TO 5% BY WEIGHT OF A WATER-SOLUBLE CHELATING COMPOUND WHICH FORMS A STABLE CHELATE WITH IRON OVER THE PH RANGE OF 7 TO 9, AND THEN NEUTRALIZING THE REACTANTS.
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) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |