US3208875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making vapor permeable sheet materials
Assignee: EIDP Inc
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Filing: 1962-01-05
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Granted: 1965-09-28
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Expires: 1982-01-05
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth K Holden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:15
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; B; B01; B01D; B01D67/00; B01D67/0039; B01D67/0044; C; C08; C08J; C08J9/00; C08J9/28; D06M; D06M23/00; D06M23/10; B01D2323/00; B01D2323/12; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/054; C08J2201/0542; Y; Y10; Y10S; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A METHOD OF MAKING VAPOR PERMEABLE SHEET MATERIALS WHICH COMPRISES (A) APPLYING TO A SUBSTATE A LAYER OF A SOLUTION OF POLYMER IN AN ORGANIC SOLVENT, (B) BATHING THE LAYER WITH A MIXTURE OF AN ORGANIC SOLVENT FOR THE POLYMER AND A NONSOLVENT FOR THE POLYMER THAT IS AT LEAST PARTIALLY MISCIBLE WITH SAID SOLVENT UNTIL THE LAYER IS COAGULATED INTO A CELLULAR STRUCTURE OF INTERCONNECTED MICROPORES, THE SOLVENT-NONSOLVENT WEIGHT RATION IN SAID MIXTURE BEING ABOUT FROM 10:90 TO 95:5, (C) REMOVING SUBSTANTIALLY ALL OF THE SOLVENT FROM THE LAYER, AND (D) REMOVING SUBSTANTIALLY ALL OF THE NONSOLVENT FROM THE RESULTING SUBSTANTIALLY SOLVENT-FREE MICROPOROUS LAYER; THE POLYMER IN STEP (A) BEING SELECTED SO THAT IT WILL HAVE A MAXIMUM ELASTIC DEFORMATION STRENGTH OF AT LEAST 100 POUNDS PER SQUARE INCH FROM THE END OF STEP (C) UNTIL THE END OF STEP (D).
Claim 2
Independent Claim
142 words
A METHOD OF MAKING VAPOR PERMEABLE SHEET MATERIALS WHICH COMPRISES (A) APPLYING TO A SUBSTATE A LAYER OF A SOLUTION OF POLYMER IN AN ORGANIC SOLVENT, (B) BATHING THE LAYER WITH A MIXTURE OF AN ORGANIC SOLVENT FOR THE POLYMER AND A NONSOLVENT FOR THE POLYMER THAT IS AT LEAST PARTIALLY MISCIBLE WITH SAID SOLVENT UNTIL THE LAYER IS COAGULATED INTO A CELLULAR STRUCTURE OF INTERCONNECTED MICROPORES, THE SOLVENT-NONSOLVENT WEIGHT RATION IN SAID MIXTURE BEING ABOUT FROM 10:90 TO 95:5, (C) REMOVING SUBSTANTIALLY ALL OF THE SOLVENT FROM THE LAYER, AND (D) REMOVING SUBSTANTIALLY ALL OF THE NONSOLVENT FROM THE RESULTING SUBSTANTIALLY SOLVENT-FREE MICROPOROUS LAYER; THE POLYMER IN STEP (A) BEING SELECTED SO THAT IT WILL HAVE A MAXIMUM ELASTIC DEFORMATION STRENGTH OF AT LEAST 100 POUNDS PER SQUARE INCH FROM THE END OF STEP (C) UNTIL THE END OF STEP (D).
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |