US2833759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Degradation of starch and starch derivatives
Assignee: Corn Products Refining Co
•
Filing: 1953-12-31
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Granted: 1958-05-06
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Expires: 1973-12-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Hobbs
- 👤 Ralph W Kerr
- 👤 Francis E Kite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:36
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR PREPARING A DEGRADED HYDROXYALKYL STARCH ETHER WHICH COMPRISES ETHERIFYING STARCH WITH AN ALKYLENE OXIDE IN AN AQUEOUS SYSTEM CONTAINING HYDRATED LIME, SAID ETHERIFICATION BEING CARRIED OUT WHILE STIRRING IN A STREAM OF MOLECULAR OXYGEN AND AT A TEMPERATURE NOT EXCEEDING ABOUT 50*C.
Claim 2
Dependent Claim
45 words
A PROCESS FOR PREPARING A DEGRADED HYDROXYALKYL STARCH ETHER WHICH COMPRISES ETHERIFYING STARCH WITH AN ALKYLENE OXIDE IN AN AQUEOUS SYSTEM CONTAINING HYDRATED LIME, SAID ETHERIFICATION BEING CARRIED OUT WHILE STIRRING IN A STREAM OF MOLECULAR OXYGEN AND AT A TEMPERATURE NOT EXCEEDING ABOUT 50*C.
References Cited (Backward Citations)
US1649269A
Cited
US2194216A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |