US2848752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of porous open-cell structure polymer films
Assignee: EIDP Inc
•
Filing: 1954-12-03
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Granted: 1958-08-26
•
Expires: 1974-12-03
Abstract
No abstract record available.
Inventors
- 👤 Bechtold Max Fredrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:11
CPC Classifications
B; B29; B29D; B29D7/00; B29C; B29C67/00; B29C67/20; B29C67/202; C; C08; C08K; C08K5/00; C08K5/16; C08K5/20; Y; Y10; Y10S; Y10S424/00; Y10S424/07; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A PROCESS FOR THE PRODUCTION OF POROUS OPEN-CELL STRUCTURE POLYMER FILMS WHICH COMPRISES (1) PREPARING A DISPERSION OF DISCRETE PARTICLES OF A HYDROPHOBIC ORGANIC ADDITION POLYMER HAVING A WHOLLY CARBON CHAIN OF ATOMS, A MOLECULAR WEIGHT OF AT LEAST 10,000 AND PARTICLE SIZE LESS THAN 3 MICRONS AND BEING TAKEN FROM THE CLASS CONSISTING VINYL AND VINYLIDENE ADDITION POLYMERS IN AN AQUEOUS MEDIUM CONTAINING FROM 10% TO 50% BY WEIGHT OF WATER-SOLUBLE ORGANIC SOLVENT FOR SAID POLYMER AND HAVING A BOILING POINT ABOVE 100*C. AND AT A CONCENTRATION INSUFFICIENT TO DISSOLVE THE POLYMER, (2) SHAPING THE DISPERSION INTO THE FORM OF A FILM, (3) REMOVING A SUBSTANTIAL AMOUNT OF THE AQUEOUS MEDIUM FROM THE SHAPED FILM BY EVAPORATION UNTIL THE POLYMER FILM BECOMES TACKY, (4) WASHING THE RESULTING TACKY FILM WITH A WATER-MISICIBLE LIQUID IN WHICH THE POLYMER IS INSOLUBLE BY WHICH DISSOLVES SAID ORGANIC SOLVENT TO FORM A POROUS OPAQUE AND COHERENT FILM SUBSTANTIALLY FREE FROM SAID ORGANIC SOLVENT AND (5) DRYING THE WASHED
Claim 2
Dependent Claim
165 words
A PROCESS FOR THE PRODUCTION OF POROUS OPEN-CELL STRUCTURE POLYMER FILMS WHICH COMPRISES (1) PREPARING A DISPERSION OF DISCRETE PARTICLES OF A HYDROPHOBIC ORGANIC ADDITION POLYMER HAVING A WHOLLY CARBON CHAIN OF ATOMS, A MOLECULAR WEIGHT OF AT LEAST 10,000 AND PARTICLE SIZE LESS THAN 3 MICRONS AND BEING TAKEN FROM THE CLASS CONSISTING VINYL AND VINYLIDENE ADDITION POLYMERS IN AN AQUEOUS MEDIUM CONTAINING FROM 10% TO 50% BY WEIGHT OF WATER-SOLUBLE ORGANIC SOLVENT FOR SAID POLYMER AND HAVING A BOILING POINT ABOVE 100*C. AND AT A CONCENTRATION INSUFFICIENT TO DISSOLVE THE POLYMER, (2) SHAPING THE DISPERSION INTO THE FORM OF A FILM, (3) REMOVING A SUBSTANTIAL AMOUNT OF THE AQUEOUS MEDIUM FROM THE SHAPED FILM BY EVAPORATION UNTIL THE POLYMER FILM BECOMES TACKY, (4) WASHING THE RESULTING TACKY FILM WITH A WATER-MISICIBLE LIQUID IN WHICH THE POLYMER IS INSOLUBLE BY WHICH DISSOLVES SAID ORGANIC SOLVENT TO FORM A POROUS OPAQUE AND COHERENT FILM SUBSTANTIALLY FREE FROM SAID ORGANIC SOLVENT AND (5) DRYING THE WASHED
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-25 | 1962-02-24 | 1962-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-25 | 1966-02-24 | 1966-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-25 | 1970-02-24 | 1970-08-26 | $7700.00 | Window Closed / Lapsed |