Patent US2698936A successfully refreshed from Google Patents.
US2698936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etherification of starch
Assignee: Blattmann and Co AG
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Filing: 1951-02-01
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Granted: 1955-01-04
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Expires: 1971-02-01
Abstract
No abstract record available.
Inventors
- 👤 Max A Staerkle
- 👤 Meier Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:48
CPC Classifications
C; C08; C08B; C08B31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR PRODUCING STARCH DERIVATIVES HAVING SELECTED SOLUBILITY AND VISCOSITY PROPERTIES, WHICH COMPRISES HEATING AND PROGRESSIVELY DEHYDRATING UNDER VACUUM A POWDERY MASS OF STARCH CONTAINING FREE MOISTURE AND A STARCH ETHERIFICATION AGENT AND MAINTAINING THE MATERIAL AT TEMPERATURES BELOW DEXTRINIZATION TEMPERATURES, UNTIL THE MATERIAL IS SUBSTANTIALLY RID OF FREE MOISTURE AND SO ANHYDROUS THAT SUBSTANTIALLY NO MOISTURE EVAPORATES FROM IT IN THE ENSUING STEPS, AND THEREAFTER, WHILE CONTINUOUSLY STIRRING THE DEHYDRATED POWDERY MATERIAL AND EXCLUDING OXYGEN FROM IT, HEATING IT AT SUBSTANTIALLY INCREASED TEMPERATURES SUFFICIENT TO DEGRADE IT THERMALLY UNTIL A DESIRED REACTION PRODUCT IS FORMED.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PRODUCING STARCH DERIVATIVES HAVING SELECTED SOLUBILITY AND VISCOSITY PROPERTIES, WHICH COMPRISES HEATING AND PROGRESSIVELY DEHYDRATING UNDER VACUUM A POWDERY MASS OF STARCH CONTAINING FREE MOISTURE AND A STARCH ETHERIFICATION AGENT AND MAINTAINING THE MATERIAL AT TEMPERATURES BELOW DEXTRINIZATION TEMPERATURES, UNTIL THE MATERIAL IS SUBSTANTIALLY RID OF FREE MOISTURE AND SO ANHYDROUS THAT SUBSTANTIALLY NO MOISTURE EVAPORATES FROM IT IN THE ENSUING STEPS, AND THEREAFTER, WHILE CONTINUOUSLY STIRRING THE DEHYDRATED POWDERY MATERIAL AND EXCLUDING OXYGEN FROM IT, HEATING IT AT SUBSTANTIALLY INCREASED TEMPERATURES SUFFICIENT TO DEGRADE IT THERMALLY UNTIL A DESIRED REACTION PRODUCT IS FORMED.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |