US3558753A
Expired / Lapsed
US
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Method of producing a porous resin by withdrawing gas from a foam extrudate while it is in a semi-molten state
Assignee: MICRO-POR Inc
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Filing: 1967-11-13
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Granted: 1971-01-26
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Expires: 1987-11-13
Abstract
Abstract MOLDING POWDER OF A POLYMERIC RESIN HAVING INTRINSIC ACID PROPERTIES, SUCH AS METHYL METHACRYALTE ACRYLONITRILEBUTADINE-STYRENE TERPOLYMER, IS ADMIXED WITH A DECOMPOSABLE CHEMICAL COMPOUND TO PRODUCE A RESULTING MIXTURE WHICH IS THEN EXTRUDED TO FORM AN EXTRUDATE. THE EXTRUDATE IS PASSED THROUGH A REDUCED PRESSURE COOLING ZONE WHILE STILL IN A SEMI-MOLTEN STATE TO REMOVE THE GASEOUS COMPONENTS OF THE DECOMPOSED CHEMICAL COMPOUND. UPON REMOVING THE SOLIDIFIED EXTRUDATE FROM THE REDUCED PRES- SURE COOLING ZONE A POROUS ARTICLE IS PRODUCED IMMEDIATELY AND WITHOUT FURTHER PROCESSING.
Inventors
- 👤 Frank E Edlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J9/08; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C67/00; B29C67/20; B29C67/202; B29K; B29K2033/00; B29K2055/00; B29K2055/02; B29L; B29L2023/00; B29L2023/22; B29L2031/00; B29L2031/70
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |