US3565982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making microporous sheets
Assignee: USM Corp
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Filing: 1968-05-17
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Granted: 1971-02-23
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Expires: 1988-05-17
Abstract
Abstract A THIN, MICROPOROUS SHEET HAVING EXCELLENT STRUCTURAL UNIFORMITY AND PERMEABILITY IS FORMED BY CASTING AND SOLIDIFYING A THICK, BODY OF A LIQUID EMULSION OF WHICH THE CONTINUOUS PHASE IS BASED ON LIQUID POLYMERIC MATERIAL REACTIVE TO FORM A FLEXIBLE, RESILIENT SOLID AND THE DISCONTINUOUS PHASE IS FINE DROPLETS OF A VOLATILE LIQUID IMMISCRIBLE AND NONREACTIVE WITH THE CONTINOUS PHASE. THE SOLIDIFIED BODY IS SLICED INTO SHEETS OF THE DESIRED THICKNESS WHILE THE LIQUID DROPLETS ARE RETAINED IN THE SOLIDIFIED MATERIAL AND THEREAFTER THE LIQUID IS REMOVED FROM THE SHEETS LEAVING PORES AND DISCONTINUITIES IN THE SOLIDIFIED MATERIAL.
Inventors
- 👤 John T Day
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:42
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; C08J2201/00; C08J2201/04; C08J2201/05; C08J2201/0502
Claims Analysis
Total Claims: 0
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |