US2985918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming shaped lengths of tetrafluoroethylene polymers having a cellular structure
Assignee: Raybestos Manhattan Inc
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Filing: 1959-01-20
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Granted: 1961-05-30
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Expires: 1979-01-20
Abstract
No abstract record available.
Inventors
- 👤 Robert L Moore
- 👤 William J Atwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS FOR FORMING SHAPED LENGTHS OF TETRAFLUOROETHYLENE POLYMERS HAVING A CELLULAR STRUCTURE WHICH COMPRISES EXTRUDING THROUGH A DIE A PASTE COMPOSITION WHICH COMPRISES AN INTIMATE MIXTURE OF FROM ABOUT 28 TO ABOUT 76% BY WEIGHT, OF UNSINTERED, FINELY DIVIDED TETRAFLUOROETHYLENE POLYMER, FROM ABOUT 10 TO ABOUT 50% OF FINELY DIVIDED METHYL METHACRYLATE POLYMER HAVING A PARTICLE SIZE OF FROM ABOUT 50 TO ABOUT 300 MICRONS, AND FROM ABOUT 14 TO ABOUT 22% OF A VOLATILE ORGANIC LUBRICANT, AND THEREAFTER HEATING THE RESULTANT SHAPED ARTICLE TO A TEMPERATURE ABOVE THE SINTERING TEMPERATURE OF THE TETRAFLUOROETHYLENE POLYMER TO SINTER THE TETRAFLUOROETHYLENE POLYMER AND TO DECOMPOSE AND VOLATILIZE SAID ACRYLIC POLYMER TO FORM MINUTE INTERCONNECTING PORES SUBSTANTIALLY UNIFORMLY DISPSERSED THROUGHOUT SAID ARTICLE.
Claim 2
Dependent Claim
120 words
A PROCESS FOR FORMING SHAPED LENGTHS OF TETRAFLUOROETHYLENE POLYMERS HAVING A CELLULAR STRUCTURE WHICH COMPRISES EXTRUDING THROUGH A DIE A PASTE COMPOSITION WHICH COMPRISES AN INTIMATE MIXTURE OF FROM ABOUT 28 TO ABOUT 76% BY WEIGHT, OF UNSINTERED, FINELY DIVIDED TETRAFLUOROETHYLENE POLYMER, FROM ABOUT 10 TO ABOUT 50% OF FINELY DIVIDED METHYL METHACRYLATE POLYMER HAVING A PARTICLE SIZE OF FROM ABOUT 50 TO ABOUT 300 MICRONS, AND FROM ABOUT 14 TO ABOUT 22% OF A VOLATILE ORGANIC LUBRICANT, AND THEREAFTER HEATING THE RESULTANT SHAPED ARTICLE TO A TEMPERATURE ABOVE THE SINTERING TEMPERATURE OF THE TETRAFLUOROETHYLENE POLYMER TO SINTER THE TETRAFLUOROETHYLENE POLYMER AND TO DECOMPOSE AND VOLATILIZE SAID ACRYLIC POLYMER TO FORM MINUTE INTERCONNECTING PORES SUBSTANTIALLY UNIFORMLY DISPSERSED THROUGHOUT SAID ARTICLE.
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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) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |