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US2915519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing cellulose nitrate
Assignee: Atlantic Research Corp
•
Filing: 1954-09-28
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Granted: 1959-12-01
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Expires: 1974-09-28
Abstract
No abstract record available.
Inventors
- 👤 William D Stewart
- 👤 Jr Edward Pondexter
- 👤 William L Wachtel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:10
CPC Classifications
C; C08; C08B; C08B5/00; C08B5/02; C08B5/04; Y; Y10; Y10S; Y10S149/00; Y10S149/11; Y10S149/111
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A PROCESS FOR MAKING SMALL, DENSE, SUBSTANTIALLY SPHERICAL PARTICLES OF CELLULOSE NITRATE, THE PARTICLES BEING CHARACTERIZED BY A MAXIMUM DIAMETER OF ABOUT 100 MICRONS, WHICH COMPRISES DISSOLVING UP TO ABOUT 20% OF THE CELLULOSE NITRATE IN AN ORGANIC SOLVENT WHICH IS MODERATELY SOLUBLE IN WATER TO THE EXTENT OF ABOUT 5 TO 80 PARTS IN 100 PARTS OF WATER AT 20*C., ANY COMPONENT OF SAID SOLVENT HAVING A WATER SOLUBILITY OF AT LEAST ABOUT 5 PARTS, DISPERSING THE CELLULOSE NITRATE SOLUTION IN WATER IN THE PRESENCE OF A POLAR, SURFACE-ACTIVE 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 100% BY WEIGHT OF THE ORGANIC SOLVENT, REMOVING THE ORGANIC SOLVENT FROM THE DISPERSED CELLULOSE NITRATE PARTICLES BY DILUTING WITH SUFFICIENT WATER TO DISSOLVE THE ORGANIC SOLVENT OUT OF THE DISPERSED CELLULOSE NITRATE PARTICLES, AND SEPARATING THE PARTICLES FROM THE WATER.
Claim 2
Dependent Claim
168 words
A PROCESS FOR MAKING SMALL, DENSE, SUBSTANTIALLY SPHERICAL PARTICLES OF CELLULOSE NITRATE, THE PARTICLES BEING CHARACTERIZED BY A MAXIMUM DIAMETER OF ABOUT 100 MICRONS, WHICH COMPRISES DISSOLVING UP TO ABOUT 20% OF THE CELLULOSE NITRATE IN AN ORGANIC SOLVENT WHICH IS MODERATELY SOLUBLE IN WATER TO THE EXTENT OF ABOUT 5 TO 80 PARTS IN 100 PARTS OF WATER AT 20*C., ANY COMPONENT OF SAID SOLVENT HAVING A WATER SOLUBILITY OF AT LEAST ABOUT 5 PARTS, DISPERSING THE CELLULOSE NITRATE SOLUTION IN WATER IN THE PRESENCE OF A POLAR, SURFACE-ACTIVE 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 100% BY WEIGHT OF THE ORGANIC SOLVENT, REMOVING THE ORGANIC SOLVENT FROM THE DISPERSED CELLULOSE NITRATE PARTICLES BY DILUTING WITH SUFFICIENT WATER TO DISSOLVE THE ORGANIC SOLVENT OUT OF THE DISPERSED CELLULOSE NITRATE PARTICLES, AND SEPARATING THE PARTICLES FROM THE WATER.
References Cited (Backward Citations)
US2027114A
Cited
US2160626A
Cited
US2375175A
Cited
US2722528A
Cited
US2715574A
Cited
US2843582A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |