US2722528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of finely divided cellulose plastics
Assignee: Hercules Powder Co
•
Filing: 1951-05-08
•
Granted: 1955-11-01
•
Expires: 1971-05-08
Abstract
No abstract record available.
Inventors
- 👤 Wallace B Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:20
CPC Classifications
C; C09; C09D; C09D101/00; C09D101/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
THE PROCESS FOR PREPARING A FINELY-DIVIDED PLASTIC COMPOSITION WHICH COMPRISES FORMING AN OIL-IN-WATER EMULSION CONTAINING, IN ADDITION TO WATER, A FILM-FORMING SUBSTANTIALLY WATER-INSOLUBLE CELLULOSIC PLASTIC SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTERS AND ETHERS CONTAINING NO OTHER ELEMENTS THAN CARBON, HYDROGEN, OXYGEN AND NITROGEN AND A SUBSTANTIALLY WATER-IMMISCIBLE VOLATILE SOLVENT FOR SAID PLASTIC CONSISTING ESSENTIALLY OF A MIXTURE OF A LOWER ALKYL CHLORIDE AND AN AUXILLARY SOLVENT HAVING A BOILLING POINT BELOW THE BOILING POINT OF WATER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKANOLS AND LOWER ALKYL ACETATES, PASSING A STREAM OF EMULSION THUS FORMED INTO A VESSEL CONTAINING AN AGITATED BODY OF HOT WATER, THE TEMPERATURE OF SAID HOT WATER BEING MAINTAINED NOT BELOW THE BOILING POINT OF SAID VOLATILE SOLVENT AT THE PRESSURE EMPLOYED WHEREBY SAID PLASTIC IS PRECIPITATED IN SAID BODY OF HOT WATER IN A FINELY DIVIDED FORM HAVING A PARTICLE SIZE NOT GREATED THAN 15 MICRONS.
Claim 2
Dependent Claim
153 words
THE PROCESS FOR PREPARING A FINELY-DIVIDED PLASTIC COMPOSITION WHICH COMPRISES FORMING AN OIL-IN-WATER EMULSION CONTAINING, IN ADDITION TO WATER, A FILM-FORMING SUBSTANTIALLY WATER-INSOLUBLE CELLULOSIC PLASTIC SELECTED FROM THE GROUP CONSISTING OF CELLULOSE ESTERS AND ETHERS CONTAINING NO OTHER ELEMENTS THAN CARBON, HYDROGEN, OXYGEN AND NITROGEN AND A SUBSTANTIALLY WATER-IMMISCIBLE VOLATILE SOLVENT FOR SAID PLASTIC CONSISTING ESSENTIALLY OF A MIXTURE OF A LOWER ALKYL CHLORIDE AND AN AUXILLARY SOLVENT HAVING A BOILLING POINT BELOW THE BOILING POINT OF WATER SELECTED FROM THE GROUP CONSISTING OF LOWER ALKANOLS AND LOWER ALKYL ACETATES, PASSING A STREAM OF EMULSION THUS FORMED INTO A VESSEL CONTAINING AN AGITATED BODY OF HOT WATER, THE TEMPERATURE OF SAID HOT WATER BEING MAINTAINED NOT BELOW THE BOILING POINT OF SAID VOLATILE SOLVENT AT THE PRESSURE EMPLOYED WHEREBY SAID PLASTIC IS PRECIPITATED IN SAID BODY OF HOT WATER IN A FINELY DIVIDED FORM HAVING A PARTICLE SIZE NOT GREATED THAN 15 MICRONS.
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) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |