US2623041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of acid-soluble cellulose derivatives
Assignee: Hercules Powder Co
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Filing: 1949-12-23
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Granted: 1952-12-23
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Expires: 1969-12-23
Abstract
No abstract record available.
Inventors
- 👤 Vernon R Grassie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B11/14; C08B11/145
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE PROCESS OF PREPARING AN ACID-SOLUBLE DIALKYLAMINOALKYL ETHER OF A CELLULOSIC COMPOUND CONTAINING ETHERIFIABLE HYDROXYL RADICALS WHEREIN THE PRODUCT CONTAINS AT LEAST ABOUT 0.4 DIALKYLAMINOALKYL GROUP PER GLUCOSE UNIT WHEN THE DIALKYLAMINOALKYL GROUP IS THE SOLE SUBSTITUENT GROUP IN THE PRODUCT AND AT LEAST ABOUT 0.25 DIALKYLAMINOALKYL GROUP PER GLUCOSE UNIT WHEN THE PRODUCT CONTAINS AT LEAST ONE SUBSTITUENT GROUP IN ADDITION TO THE DIALKYLAMINOALKYL GROUP, WHICH PROCESS COMPRISES REACTING THE CELLULOSIC COMPOUND CONTAINING ETHERFIABLE HYDROXYL RADICALS WITH AT LEAST ABOUT 2 MOLES PER GLUCOSE UNIT OF A DIALKYLAMINOALKYL HALIDE IN THE PRESENCE OF AN AQUEOUS SOLUTION OF A QUATERNARY AMMONIUM HYDROXIDE AT A TEMPERATURE OF FROM ABOUT 25* C. TO ABOUT 50* C., SAID DIALKYLAMINOALKYL HALIDE HAVING THE FORMULA
Claim 2
Dependent Claim
120 words
THE PROCESS OF PREPARING AN ACID-SOLUBLE DIALKYLAMINOALKYL ETHER OF A CELLULOSIC COMPOUND CONTAINING ETHERIFIABLE HYDROXYL RADICALS WHEREIN THE PRODUCT CONTAINS AT LEAST ABOUT 0.4 DIALKYLAMINOALKYL GROUP PER GLUCOSE UNIT WHEN THE DIALKYLAMINOALKYL GROUP IS THE SOLE SUBSTITUENT GROUP IN THE PRODUCT AND AT LEAST ABOUT 0.25 DIALKYLAMINOALKYL GROUP PER GLUCOSE UNIT WHEN THE PRODUCT CONTAINS AT LEAST ONE SUBSTITUENT GROUP IN ADDITION TO THE DIALKYLAMINOALKYL GROUP, WHICH PROCESS COMPRISES REACTING THE CELLULOSIC COMPOUND CONTAINING ETHERFIABLE HYDROXYL RADICALS WITH AT LEAST ABOUT 2 MOLES PER GLUCOSE UNIT OF A DIALKYLAMINOALKYL HALIDE IN THE PRESENCE OF AN AQUEOUS SOLUTION OF A QUATERNARY AMMONIUM HYDROXIDE AT A TEMPERATURE OF FROM ABOUT 25* C. TO ABOUT 50* C., SAID DIALKYLAMINOALKYL HALIDE HAVING THE FORMULA
References Cited (Backward Citations)
US1777970A
Cited
US2087549A
Cited
US2136296A
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US2184564A
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US2181264A
Cited
US2084125A
Cited
US2163723A
Cited
US2519249A
Cited
US2539417A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |