Patent US3296247A successfully refreshed from Google Patents.
US3296247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed cellulose ethers
Assignee: Hercules LLC
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Filing: 1964-07-06
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Granted: 1967-01-03
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Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 Eugene D Klug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:01
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/193; C08B11/02; C08B11/04; C08B11/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
PROCESS OF PREPARING HYDROXYETHYL HYDROXYPROPYL CELLULOSE WHICH COMPRISES MIXING CELLULOSIC MATERIAL, ALKALI, WATER AND A WATER-MISCIBLE INERT ORGANIC DILUENT, AND THEN CAUSING THE ALKALI CELLULOSE TO REACT WITH A HYDROXYETHYLATING AND A HYDROXYPROPYLATING AGENT UNTIL THE HYDROXYETHYL HYDROXYPROPYL CELLULOSE PRODUCT HAS A HYDROXYETHYL M.S. OF 0.05-1.0 AND A HYDROXYPROPYL M.S. OF AT LEAST 2, AND RECOVERING THE HYDROXYETHYL HYDROXYPROPYL CELLULOSE, THE ALKALI/CELLULOSE RATIO BEING 0.02-0.5, THE WATER/CELLULOSE RATIO BEING 0.1-4 AND 0.1-2 IN THE ALKALI CELLULOSE PERIOD AND ETHERIFICATION PERIOD RESPECTIVELY.
Claim 2
Dependent Claim
81 words
PROCESS OF PREPARING HYDROXYETHYL HYDROXYPROPYL CELLULOSE WHICH COMPRISES MIXING CELLULOSIC MATERIAL, ALKALI, WATER AND A WATER-MISCIBLE INERT ORGANIC DILUENT, AND THEN CAUSING THE ALKALI CELLULOSE TO REACT WITH A HYDROXYETHYLATING AND A HYDROXYPROPYLATING AGENT UNTIL THE HYDROXYETHYL HYDROXYPROPYL CELLULOSE PRODUCT HAS A HYDROXYETHYL M.S. OF 0.05-1.0 AND A HYDROXYPROPYL M.S. OF AT LEAST 2, AND RECOVERING THE HYDROXYETHYL HYDROXYPROPYL CELLULOSE, THE ALKALI/CELLULOSE RATIO BEING 0.02-0.5, THE WATER/CELLULOSE RATIO BEING 0.1-4 AND 0.1-2 IN THE ALKALI CELLULOSE PERIOD AND ETHERIFICATION PERIOD RESPECTIVELY.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |