US3190765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vapor permeable sheet material and method of making same
Assignee: EIDP Inc
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Filing: 1961-06-26
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Granted: 1965-06-22
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Expires: 1981-06-26
Abstract
No abstract record available.
Inventors
- 👤 Yuan Edward Lung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:48
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D67/00; B01D67/0002; B01D67/0009; B01D71/00; B01D71/06; B01D71/40; B01D71/401; D06N3/04; D06N3/042; D06N3/10; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/06; B01D2239/065; B01D2239/0681; B01D2323/00; B01D2323/12; B01D2323/30; Y; Y10; Y10S; Y10S264/00; Y10S264/63; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249981; Y10T428/31504; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/3158; Y10T428/31583; Y10T428/31587; Y10T428/31786; Y10T428/31797; Y10T442/00; Y10T442/20; Y10T442/2033; Y10T442/2139; Y10T442/2148; Y10T442/273
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF MAKING MICROPOROUS SHEET MATERIAL WHICH COMPRISES (1) APPLYING TO A SUBSTRATE A LAYER OF POLYMERIC SOLUTION COMPRISING (A) A SUBSTANTIALLY WATERINSOLUBLE INTERPOLYMER CONTAINING COMBINED FREE CARBOXYL, (B) A WATER-MISCIBLE ORGANIC SOLVENT FOR SAID INTERPOLYMER, AND (C) A POLYVALENT METAL OXIDE CROSS-LINKING AGENT; (2) BATHING THE LAYER WITH A WATER-CONTAINING LIQUID WHICH IS A NONSOLVENT FOR SAID INTERPOLYMER AND IS MISCIBLE WITH SAID ORGANIC SOLVENT UNTIL THE LAYER IS COAGULATED INTO A CELLULAR STRUCTURE OF INTERCONNECTED MICROPORES AND IS STABILIZED AGAINST COLLAPSE OF THE MICROPORES; AND (3) DRYING THE BATHED LAYER.
Claim 2
Independent Claim
93 words
A METHOD OF MAKING MICROPOROUS SHEET MATERIAL WHICH COMPRISES (1) APPLYING TO A SUBSTRATE A LAYER OF POLYMERIC SOLUTION COMPRISING (A) A SUBSTANTIALLY WATERINSOLUBLE INTERPOLYMER CONTAINING COMBINED FREE CARBOXYL, (B) A WATER-MISCIBLE ORGANIC SOLVENT FOR SAID INTERPOLYMER, AND (C) A POLYVALENT METAL OXIDE CROSS-LINKING AGENT; (2) BATHING THE LAYER WITH A WATER-CONTAINING LIQUID WHICH IS A NONSOLVENT FOR SAID INTERPOLYMER AND IS MISCIBLE WITH SAID ORGANIC SOLVENT UNTIL THE LAYER IS COAGULATED INTO A CELLULAR STRUCTURE OF INTERCONNECTED MICROPORES AND IS STABILIZED AGAINST COLLAPSE OF THE MICROPORES; AND (3) DRYING THE BATHED LAYER.
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) | 1968-06-21 | 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 |