US2698937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etherification of starch
Assignee: Blattmann and Co AG
•
Filing: 1953-03-17
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Granted: 1955-01-04
•
Expires: 1973-03-17
Abstract
No abstract record available.
Inventors
- 👤 Max A Staerkle
- 👤 Christoffel Clo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:53
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS FOR PRODUCING STARCH DERIVATIVES WHICH COMPRISES SUPPLYING A STARCH ETHERIFICATION AGENT TO AND CONDENSING THE SAME WITH A DEHYDRATED POWDERY STARCH MATERIAL WHICH CONTAINS NO FREE MOISTURE, WHILE CONTINUOUSLY STIRRING THE MATERIAL AND EXCLUDING OXYGEN FROM IT AND HEATING IT AT A TEMPERATURE SUBSTANTIALLY ABOVE 125* C.
Claim 2
Dependent Claim
49 words
A PROCESS FOR PRODUCING STARCH DERIVATIVES WHICH COMPRISES SUPPLYING A STARCH ETHERIFICATION AGENT TO AND CONDENSING THE SAME WITH A DEHYDRATED POWDERY STARCH MATERIAL WHICH CONTAINS NO FREE MOISTURE, WHILE CONTINUOUSLY STIRRING THE MATERIAL AND EXCLUDING OXYGEN FROM IT AND HEATING IT AT A TEMPERATURE SUBSTANTIALLY ABOVE 125* C.
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) | 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 |