US3743530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing sheet material having micro-porous structure
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1970-07-13
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Granted: 1973-07-03
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Expires: 1990-07-13
Abstract
Abstract A TOUGH AND SOFT POLYURETHANE FILM HAVING A HIGH MOISTURE PERMEABILITY AND A UNIFORM MICROPOROUS STRUCTURE IS PREPARED BY COATING A BASE MATERIAL WITH A WATER-MISCIBLE ORGANIC SOLVENT SOLUTION OF A SYNTHETIC POLYMER CONTAINING POLYURETHANE, SAID SOLUTION ALSO CONTAINING FROM 590% BY WEIGHT OF THIOUREA BASED ON THE WEIGHT OF THE POLYMER. THE COATED BASE MATERIAL IS THEN TREATED WITH AN AQUEOUS COAGULATING SOLUTION OF AN INORGANIC SALT TO COAGULATE THE POLYMER AND THEN WASHING AND DRYING SAME.
Inventors
- 👤 S Oohara
- 👤 M Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/26; D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C08J2375/00; C08J2375/04
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |