US2961712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making filled polytetrafluoroethylene articles
Assignee: Polymer Corp
•
Filing: 1957-07-10
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Granted: 1960-11-29
•
Expires: 1977-07-10
Abstract
No abstract record available.
Inventors
- 👤 William J Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:36
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/006; C; C08; C08K; C08K9/00; C08K9/08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/02; D01F6/08; D01F6/12; B29K; B29K2105/00; B29K2105/25; B29K2105/251; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/944; Y10S277/945; Y10S277/946
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD FOR MAKING FILLED POLYTETRAFLUOROETHYLENE SHAPES, COMPRISING MIXING FILLER PARTICLES WITH A FIRST AMOUNT OF UNSINTERED POLYTETRAFLUOROETHYLENE WHICH POLYTETRAFLUORETHYLENE IS IN THE FORM OF COLLOIDAL PARTICLES DISPERSED IN A DISPERSION MEDIUM. PRECIPITATING THE MIXTURE OF FILLER AND POLYTETRAFLUOROETHYLENE PARTICLES FROM THE DISPERSION, HEATING THE PRECIPITATED MIXTURE IN LOOSE, UNCOMPACTED FORM TO SINTER THE POLYTETRAFLUOROETHYLENE CONTENT THEREOF, THEREAFTER MIXING THE SINTERED MIXTURE IN FINELY DIVIDED FORM WITH AN ADDITIONAL AMOUNT OF UNSINTERED POLYTETRAFLUORETHYLENE IN PARTICLE FORM, PRESSURE FORMING THE SHAPES FROM THE THUS MIXED MATERIALS, AND SINTERING THE FORMED SHAPES.
Claim 2
Independent Claim
90 words
A METHOD FOR MAKING FILLED POLYTETRAFLUOROETHYLENE SHAPES, COMPRISING MIXING FILLER PARTICLES WITH A FIRST AMOUNT OF UNSINTERED POLYTETRAFLUOROETHYLENE WHICH POLYTETRAFLUORETHYLENE IS IN THE FORM OF COLLOIDAL PARTICLES DISPERSED IN A DISPERSION MEDIUM. PRECIPITATING THE MIXTURE OF FILLER AND POLYTETRAFLUOROETHYLENE PARTICLES FROM THE DISPERSION, HEATING THE PRECIPITATED MIXTURE IN LOOSE, UNCOMPACTED FORM TO SINTER THE POLYTETRAFLUOROETHYLENE CONTENT THEREOF, THEREAFTER MIXING THE SINTERED MIXTURE IN FINELY DIVIDED FORM WITH AN ADDITIONAL AMOUNT OF UNSINTERED POLYTETRAFLUORETHYLENE IN PARTICLE FORM, PRESSURE FORMING THE SHAPES FROM THE THUS MIXED MATERIALS, AND SINTERING THE FORMED SHAPES.
References Cited (Backward Citations)
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US2714077A
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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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |