Patent US3444535A successfully refreshed from Google Patents.
Patent US2814620A successfully refreshed from Google Patents.
US2814620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose ether processing
Assignee: Atlantic Research Corp
•
Filing: 1955-02-24
•
Granted: 1957-11-26
•
Expires: 1975-02-24
Abstract
No abstract record available.
Inventors
- 👤 William D Stewart
- 👤 William L Wachtel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:15
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A PROCESS FOR MAKING SMALL, SUBSTANTIALLY NON-POROUS, SUBSTANTIALLY SPHERICAL PARTICLES OF WATER-INSOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF ALKYL CELLULOSE AND HYDROXYALKYL CELLULOSE, WHICH COMPRISES DISSOLVING UP TO ABOUT 20% OF THE CELLULOSE ETHER IN AN ORGANIC SOLVENT HAVING A MINIMUM SOLUBILITY OF ABOUT 60 PARTS PER 100 OF WATER AT 20*C., DISPERSING THE CELLULOSE ETHER SOLUTION IN WATER IN THE PRESENCE OF A SURFACE-ACTIVE-POLAR EMULSIFYING AGENT WHICH IS PREFERENTIALLY SOLUBLE IN THE WATER, AND WHICH DOES NOT INCREASE SUBSTANTIALLY THE VISCOSITY OF THE WATER PHASE; THE WATER BEING PRESENT IN AMOUNT SUFFICIENT TO FORM AN OIL-IN-WATER EMULSION AND UP TO ABOUT 150% BY VOLUME BASED ON THE ORGANIC SOLVENT, REMOVING THE ORGANIC SOLVENT FROM THE DISPERSED CELLULOSE ETHER PARTICLES, THE TEMPERATURE OF THE EMULSION DURING SUBSTANTIAL SOLVENT REMOVAL BEING UP TO THE BOILING POINT OF THE SOLVENT BUT BELOW THE BOILING POINT OF WATER, AND SEPARATING THE PARTICLES FROM THE WATER.
Claim 2
Dependent Claim
154 words
A PROCESS FOR MAKING SMALL, SUBSTANTIALLY NON-POROUS, SUBSTANTIALLY SPHERICAL PARTICLES OF WATER-INSOLUBLE CELLULOSE ETHER SELECTED FROM THE GROUP CONSISTING OF ALKYL CELLULOSE AND HYDROXYALKYL CELLULOSE, WHICH COMPRISES DISSOLVING UP TO ABOUT 20% OF THE CELLULOSE ETHER IN AN ORGANIC SOLVENT HAVING A MINIMUM SOLUBILITY OF ABOUT 60 PARTS PER 100 OF WATER AT 20*C., DISPERSING THE CELLULOSE ETHER SOLUTION IN WATER IN THE PRESENCE OF A SURFACE-ACTIVE-POLAR EMULSIFYING AGENT WHICH IS PREFERENTIALLY SOLUBLE IN THE WATER, AND WHICH DOES NOT INCREASE SUBSTANTIALLY THE VISCOSITY OF THE WATER PHASE; THE WATER BEING PRESENT IN AMOUNT SUFFICIENT TO FORM AN OIL-IN-WATER EMULSION AND UP TO ABOUT 150% BY VOLUME BASED ON THE ORGANIC SOLVENT, REMOVING THE ORGANIC SOLVENT FROM THE DISPERSED CELLULOSE ETHER PARTICLES, THE TEMPERATURE OF THE EMULSION DURING SUBSTANTIAL SOLVENT REMOVAL BEING UP TO THE BOILING POINT OF THE SOLVENT BUT BELOW THE BOILING POINT OF WATER, AND SEPARATING THE PARTICLES FROM THE WATER.
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) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |