US3135738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of starch with n, n' methylene bisacrylamide, n-methylol acrylamide, or acrylamide and formaldehyde
Assignee: Primary Products Ingredients Americas LLC
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Filing: 1959-04-23
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Granted: 1964-06-02
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Expires: 1979-04-23
Abstract
No abstract record available.
Inventors
- 👤 Merchant L Cushing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:03
CPC Classifications
C; C08; C08B; C08B31/00; C08B31/003; C08B31/08; C08B31/12; C08B31/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
THE METHOD OF CHEMICALLY MODIFYING STARCH THAT COMPRISES REACTING GRANULAR STARCH WITH N,N''-METHYLENE BISACRYLAMIDE IN THE PRESENCE OF AN EFFECTIVE QUANTITY OF AN ALKALINE CATALYST WHILE MAINTAINING THE STARCH IN UNGELATINIZED CONDITION TO PRODUCE AN UNGELATINIZED STARCH DERIVATIVE CONTAINING CARBAMYL ETHYL GROUP, THE REACTION CONDITIONS HAVING A GELATINIZING EFECT ON THE PRODUCT NO GREATER THAN ABOUT 7 PARTS BY WEIGHT OF SODIUM HYDROXIDE PER ANHYDROGLUCOSE UNIT IN SATURATED AQUEOUS SODIUM SULFATE AT 100*F.
Claim 2
Independent Claim
73 words
THE METHOD OF CHEMICALLY MODIFYING STARCH THAT COMPRISES REACTING GRANULAR STARCH WITH N,N''-METHYLENE BISACRYLAMIDE IN THE PRESENCE OF AN EFFECTIVE QUANTITY OF AN ALKALINE CATALYST WHILE MAINTAINING THE STARCH IN UNGELATINIZED CONDITION TO PRODUCE AN UNGELATINIZED STARCH DERIVATIVE CONTAINING CARBAMYL ETHYL GROUP, THE REACTION CONDITIONS HAVING A GELATINIZING EFECT ON THE PRODUCT NO GREATER THAN ABOUT 7 PARTS BY WEIGHT OF SODIUM HYDROXIDE PER ANHYDROGLUCOSE UNIT IN SATURATED AQUEOUS SODIUM SULFATE AT 100*F.
Claim 3
Dependent Claim
22 words
A CROSSLINKED CARBAMYL ETHYL STARCH ETHER CONTAINING CARBAMYL ETHYL GROUPS AT LEAST PARTLY CROSSLINKED THROUGH METHYLENE GROUPS INTRODUCED BY REACTION WITH FORMALDEHYDE.
Claim 4
Dependent Claim
22 words
A CROSSLINKED CARBAMYL ETHYL STARCH ETHER CONTAINING CARBAMYL ETHYL GROUPS AT LEAST PARTLY CROSSLINKED THROUGH METHYLENE GROUPS INTRODUCED BY REACTION WITH FORMALDEHYDE.
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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) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |