Patent US1278148A successfully refreshed from Google Patents.
Patent US3357971A successfully refreshed from Google Patents.
US3357971A
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: 1967-12-12
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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
2026-11-05 18:49
CPC Classifications
C; C08; C08B; C08B13/00; C08B11/00; C08B11/02; C08B11/04; C08B11/08; C08B11/10; C08B11/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
PROCESS OF PREPARING A MIXED CELLULOSE DERIVATIVE COMPRISING MIXING CELLULOSIC MATERIAL, ALKALI, WATER AND A WATER MISCIBLE INERT ORGANIC DILUENT, AND THEN CAUSING THE ALKALI CELLULOSE TO REACT WITH HYDROXYPROPYLATING AGENT AND A SECOND AGENT WHICH IMPARTS IONIC CHARACTER TO THE CELLULOSE DERIVATIVE, CONTAINUING THE REACTION UNTIL SAID DERIVATIVE HAS A HYDROXYPROPYL M.S. AND AN IONIC D.S. OF AT LEAST 2 AND 0.00U-0.4, RESPECTIVELY 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
86 words
PROCESS OF PREPARING A MIXED CELLULOSE DERIVATIVE COMPRISING MIXING CELLULOSIC MATERIAL, ALKALI, WATER AND A WATER MISCIBLE INERT ORGANIC DILUENT, AND THEN CAUSING THE ALKALI CELLULOSE TO REACT WITH HYDROXYPROPYLATING AGENT AND A SECOND AGENT WHICH IMPARTS IONIC CHARACTER TO THE CELLULOSE DERIVATIVE, CONTAINUING THE REACTION UNTIL SAID DERIVATIVE HAS A HYDROXYPROPYL M.S. AND AN IONIC D.S. OF AT LEAST 2 AND 0.00U-0.4, RESPECTIVELY 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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-11 | 1971-06-12 | 1971-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-11 | 1975-06-12 | 1975-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-11 | 1979-06-12 | 1979-12-12 | $7700.00 | Window Closed / Lapsed |