Patent US2801241A successfully refreshed from Google Patents.
US2801241A
Expired / Lapsed
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Process for the production of starch ethers
Assignee: Corn Products Refining Co
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Filing: 1953-07-02
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Granted: 1957-07-30
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Expires: 1973-07-02
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:08
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
THE PROCESS OF PREPARING STARCH ETHERS WHICH COMPRISES REACTING STARCH WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF LOWER ALIPHATIC ALKYLENE OXIDES, STYRENE OXIDE AND GLYCIDYL ISOPROPYL ETHER, IN CONTACT WITH CALCIUM HYDROXIDE AT A TEMPERATURE NOT EXCEEDING ABOUT 45* TO ABOUT 50*C., FOR A SUFFICIENT PERIOD OF TIME TO PRODUCE THE DESIRED DEGREE OF ETHERIFICATION BUT INSUFFICIENT TO GELANTINIZE THE STARCH AND NEUTRALIZING SAID CALCIUM HYDROXIDE; THE AMOUNT OF CALCIUM HYDROXIDE BEING SUFFICIENT TO GIVE AN ALKALINITY TO THE STARCH OF 0.05 TO 0.15, THE MOISTURE CONTENT OF THE STARCH BEING AT LEAST ABOUT 12 PERCENT DURING THE REACTION.
Claim 2
Dependent Claim
101 words
THE PROCESS OF PREPARING STARCH ETHERS WHICH COMPRISES REACTING STARCH WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF LOWER ALIPHATIC ALKYLENE OXIDES, STYRENE OXIDE AND GLYCIDYL ISOPROPYL ETHER, IN CONTACT WITH CALCIUM HYDROXIDE AT A TEMPERATURE NOT EXCEEDING ABOUT 45* TO ABOUT 50*C., FOR A SUFFICIENT PERIOD OF TIME TO PRODUCE THE DESIRED DEGREE OF ETHERIFICATION BUT INSUFFICIENT TO GELANTINIZE THE STARCH AND NEUTRALIZING SAID CALCIUM HYDROXIDE; THE AMOUNT OF CALCIUM HYDROXIDE BEING SUFFICIENT TO GIVE AN ALKALINITY TO THE STARCH OF 0.05 TO 0.15, THE MOISTURE CONTENT OF THE STARCH BEING AT LEAST ABOUT 12 PERCENT DURING THE REACTION.
References Cited (Backward Citations)
US2461139A
Cited
US2516634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |