US2621174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino derivatives of glucopyranose polymers
Assignee: Keever Starch Co
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Filing: 1950-06-16
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Granted: 1952-12-09
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Expires: 1970-06-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Gaver
- 👤 Esther P Lasure
- 👤 Levi M Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:33
CPC Classifications
C; C08; C08B; C08B31/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
THE PROCESS OF TREATING STARCH WHICH COMPRISES THE STEP OF MIXING STARCH WITH AN AMINE AT A TEMPERATURE DURING THE REACTION PERIOD IN AQUEOUS SYSTEM WHEREIN THERE IS PROVIDED A NONAQUEOUS SOLVENT HAVING A BOILING POINT AT ATMOSPHERIC PRESSURE HIGHER THAN 80* C.
Claim 2
Dependent Claim
86 words
THE PROCESS OF FORMING GLUCOPYRANOSE POLYMER PRODUCTS WHICH COMPRISES THE STEP OF MIXING GLUCOPYRANOSE POLYMERS WITH AN AMINO COMPOUND SELECTED FROM THE CLASS CONSISTING OF ETHYLENE DIAMINE, PHENYLENE DIAMINE, PROPYLENE DIAMINE, AND THEPOLYMERS OF ETHYLENE DIAMINE WHICH HAVE NOT MORE THAN FIVE FREE AMINO GROUPS IN A NON-AQUEOUS SYSTEM AT A TEMPRATURE IN THE RANGE OF FROM 80* C. TO 115* C. IN SUBSTANTIALLY STOICHIOMETRIC QUANTITIES SO THAT ONE AMINO GROUP OF EACH POLY AMINO MOLECULE MAY REACT WITH A SEPARATE UNIT OF THE GLUCOPYRANOSE POLYMERS.
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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) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |