Patent US3135739A successfully refreshed from Google Patents.
US3135739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etherifying granule starch in aliphatic ketone solvent medium
Assignee: Penick and Ford Ltd Inc
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Filing: 1961-08-21
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Granted: 1964-06-02
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Expires: 1981-08-21
Abstract
No abstract record available.
Inventors
- 👤 Erling T Hjermstad
- 👤 Larry C Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:07
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
IN THE PROCESS OF PRODUCING HIGHLY SUBSTITUTED STARCH ETHERS IN THE UNGELATINIZED GRANULE STATE, THE STEPS COMPRISING FORMING A SUSPENSION OF MOIST ALKALINE GRANULE STARCH IN AN ALIPHATIC KETONE SELECTED FROM THE CLASS CONSISTING OF ACETONE AND METHYL ETHYL KETONE, SAID GRANULE STARCH HAVING INTIMATELY ASSOCIATED THEREWITH FROM 5 TO 40% OF WATER BASED ON THE DRY ALKALI-FREE WEIGHT OF SAID GRANULE STARCH, SAID SUSPENSION CONTAINING FROM ABOUT 1 TO 3 PARTS BY WEIGHT OF KETONE PER PART OF SAID ALKALI-FREE DRY STARCH, INTRODUCING INTO SAID REACTION MEDIUM AN ORGANIC ETHERIFYING AGENT REACTING MONOFUNCTIONALLY WITH STARCH, SAID ETHERIFYING AGENT PROVIDING IN EXCESS OF .5 ETHER-FORMING GROUPS PER ANHYDROGLUCOSE UNIT OF SAID GRANULE STARCH, REACTING SAID STARCH WITH SAID ETHERIFYING AGENT WITHOUT GELATINIZING SAID STARCH UNTIL SAID STARCH CONTAINS IN EXCESS .5 ETHER GROUP PER ANHYDROGLUCOSE UNIT.
Claim 2
Dependent Claim
136 words
IN THE PROCESS OF PRODUCING HIGHLY SUBSTITUTED STARCH ETHERS IN THE UNGELATINIZED GRANULE STATE, THE STEPS COMPRISING FORMING A SUSPENSION OF MOIST ALKALINE GRANULE STARCH IN AN ALIPHATIC KETONE SELECTED FROM THE CLASS CONSISTING OF ACETONE AND METHYL ETHYL KETONE, SAID GRANULE STARCH HAVING INTIMATELY ASSOCIATED THEREWITH FROM 5 TO 40% OF WATER BASED ON THE DRY ALKALI-FREE WEIGHT OF SAID GRANULE STARCH, SAID SUSPENSION CONTAINING FROM ABOUT 1 TO 3 PARTS BY WEIGHT OF KETONE PER PART OF SAID ALKALI-FREE DRY STARCH, INTRODUCING INTO SAID REACTION MEDIUM AN ORGANIC ETHERIFYING AGENT REACTING MONOFUNCTIONALLY WITH STARCH, SAID ETHERIFYING AGENT PROVIDING IN EXCESS OF .5 ETHER-FORMING GROUPS PER ANHYDROGLUCOSE UNIT OF SAID GRANULE STARCH, REACTING SAID STARCH WITH SAID ETHERIFYING AGENT WITHOUT GELATINIZING SAID STARCH UNTIL SAID STARCH CONTAINS IN EXCESS .5 ETHER GROUP PER ANHYDROGLUCOSE UNIT.
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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |