US3190766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making vapor permeable sheet materials
Assignee: EIDP Inc
•
Filing: 1961-10-31
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Granted: 1965-06-22
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Expires: 1981-10-31
Abstract
No abstract record available.
Inventors
- 👤 Edward L Yuan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; D; D06; D06N; D06N3/00; D06N3/04; D06N3/10; D06N3/12; D06N3/14; C08J2201/00; C08J2201/04; C08J2201/054; C08J2201/0542; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A METHOD OF MAKING VAPOR PERMEABLE SHEET MATERIALS WHICH COMPRISES (A) ADMIXING A TREATING LIQUID WITH A SOLUTION OF POLYMER IN AN ORGAINC SOLVENT IN AN AMOUNT SUFFICIENT TO RENDER THE RESULTIG MIXTURE SEPARABLE INTO A POLYMERIC GEL PORTION AND A LIQUID PORTION SAID SOLVENT AND SAID TREATING LIQUID BEING AT LEAST PARTIALLY MISCIBLE WITH EACH OTHER, AND SAID TREATING LIQUID BEING A NONCOLVENT FOR THE POLYMER; (B) SEPARATING AND REMOVING THE GEL PORTION FROM THE LIQUID PORTION; (C) COATING A POROUS SUBSTRATE WITH A LAYER OF GEL; (D) BATHING THE LAYER OF GEL WITH A TREATING LIQUID AS DEFINED IN STEP (A) UNTIL THE LAYER IS COAGULATED INTO A CELLULAR STRUCTURE OF INTERCONNECTED MICROPORES AND UNTIL THE LAYER IS SUBSTANTIALLY FREE OF SAID ORGANIC SOLVENT; AND (E) DRYING THE RESULTING MICROPOROUS LAYER, SAID POLYMER HAVING A MAXIMUM ELASTIC DEFORMATION STRENGTH OF AT LEAST 100 POUNDS PER SQUARE INCH FROM THE TIME THE LAYER OF GEL HAS BEEN BATHED UNTIL IT HAS BEEN DRIED.
Claim 2
Independent Claim
164 words
A METHOD OF MAKING VAPOR PERMEABLE SHEET MATERIALS WHICH COMPRISES (A) ADMIXING A TREATING LIQUID WITH A SOLUTION OF POLYMER IN AN ORGAINC SOLVENT IN AN AMOUNT SUFFICIENT TO RENDER THE RESULTIG MIXTURE SEPARABLE INTO A POLYMERIC GEL PORTION AND A LIQUID PORTION SAID SOLVENT AND SAID TREATING LIQUID BEING AT LEAST PARTIALLY MISCIBLE WITH EACH OTHER, AND SAID TREATING LIQUID BEING A NONCOLVENT FOR THE POLYMER; (B) SEPARATING AND REMOVING THE GEL PORTION FROM THE LIQUID PORTION; (C) COATING A POROUS SUBSTRATE WITH A LAYER OF GEL; (D) BATHING THE LAYER OF GEL WITH A TREATING LIQUID AS DEFINED IN STEP (A) UNTIL THE LAYER IS COAGULATED INTO A CELLULAR STRUCTURE OF INTERCONNECTED MICROPORES AND UNTIL THE LAYER IS SUBSTANTIALLY FREE OF SAID ORGANIC SOLVENT; AND (E) DRYING THE RESULTING MICROPOROUS LAYER, SAID POLYMER HAVING A MAXIMUM ELASTIC DEFORMATION STRENGTH OF AT LEAST 100 POUNDS PER SQUARE INCH FROM THE TIME THE LAYER OF GEL HAS BEEN BATHED UNTIL IT HAS BEEN DRIED.
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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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |