Patent US2496347A successfully refreshed from Google Patents.
Patent US3582393A successfully refreshed from Google Patents.
US3582393A
Expired / Lapsed
US
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Method of producing porous sheet material
Assignee: Kanegafuchi Spinning Co Ltd
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Filing: 1968-11-04
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Granted: 1971-06-01
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Expires: 1988-11-04
Abstract
Abstract A HYGROSCOPIC ORGANIC SOLVENT BASED COATING SOLUTION CONTAINING POLYURETHANE AND 1-30% BY WEIGHT (BASED ON THE POLYURETHANE) OR A HIGHER FATTY ACID IS APPLIED TO A SURFACE OF A BASE MATERIAL. THE APPLIED COATING SOLUTION IS THEN COAGULATED IN A COAGULATING BATH CONSISTING OF AN AQUEOUS SOLUTION OF AN INORGANIC SALT. IT IS THEN WASHED AND DRIED. THE FATTY ACID IS SELECTED FROM THE GROUP CONSISTING OF STEARIC ACID, MYRISITC ACID, PALMITIC ACID, LAURIC ACID AND OLEIC ACID.
Inventors
- 👤 Tatsunori Shikada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08K; C08K5/00; C08K5/04; C08K5/09; D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |