US3058166A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making porous articles from fluoroethylene polymers
Assignee: EIDP Inc
•
Filing: 1960-03-21
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Granted: 1962-10-16
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Expires: 1980-03-21
Abstract
No abstract record available.
Inventors
- 👤 Fields Reuben Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:52
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/26; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10S; Y10S264/00; Y10S264/63
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A PROCESS FOR PREPARING POROUS POLYTETRAFLUOROETHYLENE MOLDINGS WHICH COMPRISES PREPARING A UNIFORM MIXTURE OF POLYTETRAFLUOROETHYLENE POWDER AND FROM 10 TO 85% BY VOLUME OF A SOLID ORGANIC MATERIAL HAVING A COMPRESSIBILITY SUBSTANTIALLY EQUAL TO THAT OF POLYTETRAFLUOROETHYLENE AND CAPABLE OF GASIFICATION AT A TEMPERATURE BELOW 300* C, MOLDING SAID MIXTURE AT A TEMPERATURE BELOW SAID GASIFICATION TEMPERATURE AND AT A PRESSURE OF AT LEAST 1500 P.S.I. REMOVING THE RESULTING PERFORM AND HEATING THE PERFORM AT A TEMPERATURE RANGING FROM THE GASIFICATION TEMPERATURE TO 327* C, UNTIL ALL VAPORIZABLE MATERIAL HAS BEEN REMOVED, AND THEREAFTER SINTERING THE RESULTING PERFORM AT A TEMPERATURE OF 330 TO 400* C.
Claim 2
Dependent Claim
106 words
A PROCESS FOR PREPARING POROUS POLYTETRAFLUOROETHYLENE MOLDINGS WHICH COMPRISES PREPARING A UNIFORM MIXTURE OF POLYTETRAFLUOROETHYLENE POWDER AND FROM 10 TO 85% BY VOLUME OF A SOLID ORGANIC MATERIAL HAVING A COMPRESSIBILITY SUBSTANTIALLY EQUAL TO THAT OF POLYTETRAFLUOROETHYLENE AND CAPABLE OF GASIFICATION AT A TEMPERATURE BELOW 300* C, MOLDING SAID MIXTURE AT A TEMPERATURE BELOW SAID GASIFICATION TEMPERATURE AND AT A PRESSURE OF AT LEAST 1500 P.S.I. REMOVING THE RESULTING PERFORM AND HEATING THE PERFORM AT A TEMPERATURE RANGING FROM THE GASIFICATION TEMPERATURE TO 327* C, UNTIL ALL VAPORIZABLE MATERIAL HAS BEEN REMOVED, AND THEREAFTER SINTERING THE RESULTING PERFORM AT A TEMPERATURE OF 330 TO 400* C.
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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) | 1965-10-15 | 1966-04-16 | 1966-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-15 | 1970-04-16 | 1970-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-15 | 1974-04-16 | 1974-10-16 | $7700.00 | Window Closed / Lapsed |