US2843582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of finely-divided cellulose derivatives
Assignee: Hercules Powder Co
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Filing: 1954-04-08
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Granted: 1958-07-15
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Expires: 1974-04-08
Abstract
No abstract record available.
Inventors
- 👤 Robert S Voris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
C; C09; C09D; C09D101/00; C09D101/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A PROCESS FOR PREPARING A FINELY-DIVIDED CELLULOSE DERIVATIVE WHICH COMPRISES PREPARING A LACQUER SOLUTION BY DISSOLVING A FILM-FORMING CELLULOSE DERIVATIVE OF THE GROUP CONSISTING OF CELLULOSE ESTERS AND ETHERS AND MIXTURES THEREOF IN SUBSTANTIALLY WATER-IMMISCIBLE VOLATILE SOLVENT WHICH BOILS BELOW THE BOILING POINT OF WATER, EMULSIFYING THE LACQUER SOLUTION THUS FORMED IN AN AQUEOUS PHASE CONSISTING OF WATER AND AN EMULSIFYING AGENT TO FORM A LACQUER-IN-WATER EMULSION, FORMING A THIN LAYER OF THE EMULSION ON A SURFACE HEATED TO AN ELEVATED TEMPERATURE BELOW THE BOILING POINT OF WATER, AND EVAPORATING THE VOLATILE SOLVENT FROM THE EMULSIFIED LACQUER WITHOUT SUBSTANTIAL EVAPORATION OF WATER FROM SAID EMULSION TO PRECIPITATE THE CELLULOSE DERIVATIVE IN FINELY-DIVIDED FORM IN THE WATER OF THE EMULSION.
Claim 2
Dependent Claim
119 words
A PROCESS FOR PREPARING A FINELY-DIVIDED CELLULOSE DERIVATIVE WHICH COMPRISES PREPARING A LACQUER SOLUTION BY DISSOLVING A FILM-FORMING CELLULOSE DERIVATIVE OF THE GROUP CONSISTING OF CELLULOSE ESTERS AND ETHERS AND MIXTURES THEREOF IN SUBSTANTIALLY WATER-IMMISCIBLE VOLATILE SOLVENT WHICH BOILS BELOW THE BOILING POINT OF WATER, EMULSIFYING THE LACQUER SOLUTION THUS FORMED IN AN AQUEOUS PHASE CONSISTING OF WATER AND AN EMULSIFYING AGENT TO FORM A LACQUER-IN-WATER EMULSION, FORMING A THIN LAYER OF THE EMULSION ON A SURFACE HEATED TO AN ELEVATED TEMPERATURE BELOW THE BOILING POINT OF WATER, AND EVAPORATING THE VOLATILE SOLVENT FROM THE EMULSIFIED LACQUER WITHOUT SUBSTANTIAL EVAPORATION OF WATER FROM SAID EMULSION TO PRECIPITATE THE CELLULOSE DERIVATIVE IN FINELY-DIVIDED FORM IN THE WATER OF THE EMULSION.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |