US3576686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making microporous films
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1968-09-18
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Granted: 1971-04-27
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Expires: 1988-09-18
Abstract
Abstract A METHOD OF MAKING A MICROPOROUS FILM COMPRISING ADMIXING TO A LIQUID PLASTISOL-TYPE RESIN A WATER-SOLUBLE MATERIAL, THAT IS SOLUBLE IN THE LIQUID PLASTICIZER AND A NONSOLVENT FOR THE POLYMER PARTICLES, CASTING A FILM THEREFROM, CURING THE FILM BY APPLYING SUFFICIENT HEAT TO CAUSE FUSION BETWEEN THE POLYMER PARTICLES, AND WASHING THE WATER-SOLUBLE MATERIAL FROM THE FILM TO CREATE VOIDS IN THE FILM FOR PASSAGE OF MOISTURE.
Inventors
- 👤 Claude J Schmidle
- 👤 George Shkapenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:46
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C67/202; C; C08; C08J; C08J9/00; C08J9/26; D; D06; D06N; D06N3/00; D06N3/0043; D06N3/0052; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/387
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |