Patent US2773057A successfully refreshed from Google Patents.
US2773057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing starch ether derivatives and new starch ether derivatives produced thereby
Assignee: Penick and Ford Ltd Inc
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Filing: 1952-02-20
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Granted: 1956-12-04
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Expires: 1972-02-20
Abstract
No abstract record available.
Inventors
- 👤 Erling T Hjermstad
- 👤 Carl C Kesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:00
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A METHOD OF PRODUCING PARTIALLY ETHERIFIELD, FILTERABLE, GRANULE STARCH, THE STEP OF REACTING UNSWOLLEN, GRANULE STARCH WITH A MONOCHLORINE SUBSTITUTED ORGANIC ETHERIFYING AGENT REACTING MONOFUNCTIONALLY WITH STARCH AND IN WHICH THE CHLORINE ATOM IS ATTACHED TO A SINGLEBONDED CARBON ATOM IN AN ALIPHATIC CHAIN, SAID ETHERIFYING AGENT BEING FREE OF HYDROXYL AND EPOXY GROUPS, SAID REACTION BEING CARRIED OUT IN AN ALKALINE AQUEOUS REACTION MEDIUM IN THE PRESENCE OF A SUFFICIENT AMOUNT OF AN ALKALI METAL SALT CAPABLE OF INHIBITING GELATINIZATION OF STARCH SO THAT SAID STARCH REMAINS FILTERABLE DURING THE COURSE OF SAID REACTION, SAID ALKALI METAL SALT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, AND LITHIUM, CHLORIDES, CARBONATES, ACETATES, NITRATES AND SULFATES.
Claim 2
Dependent Claim
117 words
IN A METHOD OF PRODUCING PARTIALLY ETHERIFIELD, FILTERABLE, GRANULE STARCH, THE STEP OF REACTING UNSWOLLEN, GRANULE STARCH WITH A MONOCHLORINE SUBSTITUTED ORGANIC ETHERIFYING AGENT REACTING MONOFUNCTIONALLY WITH STARCH AND IN WHICH THE CHLORINE ATOM IS ATTACHED TO A SINGLEBONDED CARBON ATOM IN AN ALIPHATIC CHAIN, SAID ETHERIFYING AGENT BEING FREE OF HYDROXYL AND EPOXY GROUPS, SAID REACTION BEING CARRIED OUT IN AN ALKALINE AQUEOUS REACTION MEDIUM IN THE PRESENCE OF A SUFFICIENT AMOUNT OF AN ALKALI METAL SALT CAPABLE OF INHIBITING GELATINIZATION OF STARCH SO THAT SAID STARCH REMAINS FILTERABLE DURING THE COURSE OF SAID REACTION, SAID ALKALI METAL SALT BEING SELECTED FROM THE GROUP CONSISTING OF SODIUM, POTASSIUM, AND LITHIUM, CHLORIDES, CARBONATES, ACETATES, NITRATES AND SULFATES.
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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |