US2806857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-cross-linked starch ethers and method of producing same
Assignee: Corn Products Refining Co
•
Filing: 1954-04-22
•
Granted: 1957-09-17
•
Expires: 1974-04-22
Abstract
No abstract record available.
Inventors
- 👤 Eugene F Paschall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:28
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08; C08B31/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
THE PROCESS OF PREPARING NON-CROSS-LINKIED STARCH ETHERS WHICH COMPRISES REACTING EQUIMOLAR QUANTITIES OF EPICHLOROHYDRIN AND AN ALKALI METAL BISULFITE IN CONTACT WITH AN AMOUNT OF AN ALKALI METAL SULFITE UP TO ABOUT 20 PERCENT OF THE BISULFITE, THE TEMPERATURE OF THE REACTION NOT EXCEEDING ABOUT 20* C., REMOVING UNREACTED EPICHLOROHYDRIN, AND REACTING THE EPICHLOROHYDRIN SULFITE ADDITION PRODUCT WITH AN EQUIMOLAR QUANTITY OF AN ALKALI METAL HYDROXIDE, THEN REACTING THE RESULTING PRODUCT WITH STARCH IN CONTACT WITH 0.03 TO 0.2. MOLE OF AN ALKALINE CATALYST PER MOLE OF ANHYDROGLUCOSE RESIDUE OF THE STARCH; SAID CATALYST BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES, ALKALINE EARTH OXIDES AND HYDROXIDES, AND QUATERNARY AMMONIUM BASES.
Claim 2
Dependent Claim
8 words
PRODUCT ACCORDING TO THE PROCESS OF CLAIM 3.
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) | 1960-09-16 | 1961-03-18 | 1961-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-16 | 1965-03-18 | 1965-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-16 | 1969-03-18 | 1969-09-17 | $7700.00 | Window Closed / Lapsed |