US2858305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of alkyl ethers of starch in unswollen granule form
Assignee: Corn Products Refining Co
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Filing: 1956-01-26
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Granted: 1958-10-28
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:13
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR PRODUCING ALKYL ETHERS OF STARCH IN UNSWOLLEN GRANULE FORM WHICH COMPRISES REACTING STARCH IN UNSWOLLEN GRANULE FORM WITH A ALKYL ESTER OF A POLYBASIC INORGANIC OXY-ACID IN AQUEOUS MEDIUM CONTAINING SODIUM HYDROXIDE CATALYST AND SODIUM SULFATE TO INHIBIT STARCH GRANULE SWELLING AND RECOVERING THE ALKYL STARCH, THE PH OF THE SYSTEM BEING MAINTAINED AT ABOUT 10 TO 11 DURING ETERIFICATION AND THE TEMPERATURE NOT EXCEEDING THE GELATINIZATION TEMPERATURE OF TE STARCH IN THE REACTION MEDIUM; ALKYL GROUP OF SAID ETHER AND ESTER CONTAINING FROM 1 TO 4 CARBON ATOMS.
Claim 2
Dependent Claim
92 words
A PROCESS FOR PRODUCING ALKYL ETHERS OF STARCH IN UNSWOLLEN GRANULE FORM WHICH COMPRISES REACTING STARCH IN UNSWOLLEN GRANULE FORM WITH A ALKYL ESTER OF A POLYBASIC INORGANIC OXY-ACID IN AQUEOUS MEDIUM CONTAINING SODIUM HYDROXIDE CATALYST AND SODIUM SULFATE TO INHIBIT STARCH GRANULE SWELLING AND RECOVERING THE ALKYL STARCH, THE PH OF THE SYSTEM BEING MAINTAINED AT ABOUT 10 TO 11 DURING ETERIFICATION AND THE TEMPERATURE NOT EXCEEDING THE GELATINIZATION TEMPERATURE OF TE STARCH IN THE REACTION MEDIUM; ALKYL GROUP OF SAID ETHER AND ESTER CONTAINING FROM 1 TO 4 CARBON ATOMS.
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) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |