US4042747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket and sealing structures of filled polytetrafluoroethylene resins
Assignee: Individual
•
Filing: 1975-03-14
•
Granted: 1977-08-16
•
Expires: 1995-03-14
Abstract
Abstract Disclosed are gasket and seal materials comprising particulate material interconnected and entrapped by fibrillated polytetrafluoroethylene and methods for manufacturing and using them.
Inventors
- 👤 Ernest J. Breton
- 👤 Dexter Worden
- 👤 Melville E. Pugh, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/102; C; C09; C09K; C09K3/00; C09K3/10; C09K3/1025; C09K3/1028; F16J15/16; F16J15/18; F16J15/20; C09K2200/00; C09K2200/02; C09K2200/0204; C09K2200/0208; C09K2200/0213; C09K2200/0217; C09K2200/0243; C09K2200/0269; C09K2200/04; C09K2200/0447; C09K2200/06; C09K2200/0692; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/25; Y10T428/252; Y10T428/256; Y10T428/259; Y10T428/29; Y10T428/2982; Y10T428/31504; Y10T428/3154; Y10T428/31544
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A self-sustaining, flexible, non-woven material consisting essentially of from about 65 to 95 percent by volume of a solid particulate material and from about 5 to 35 percent by volume of polytetrafluoroethylene resin, said volume percentages being based upon the amount of particulate material and polytetrafluoroethylene present, said particulate material being interconnected and intertwined by fibrils of said polytetrafluoroethylene to impart a self-sustaining condition and flexibility to the non-woven material, and additionally containing from about 40 to 60 percent by volume of the non-woven material to grease, said grease having a viscosity between about 10 to 1000 poises at temperatures between about 10 and 150° C. and being uniformly distributed throughout the non-woven material, said non-woven material having been prepared by mechanically working a mixture of said particulate material, polytetrafluoroethylene and grease until fibrillation of the polytetrafluoroethylene occurs and the resulting fibrils interconnect and intertwine the particulate material.
Claim 2
Dependent Claim
148 words
A self-sustaining, flexible, non-woven material consisting essentially of from about 65 to 95 percent by volume of a solid particulate material and from about 5 to 35 percent by volume of polytetrafluoroethylene resin, said volume percentages being based upon the amount of particulate material and polytetrafluoroethylene present, said particulate material being interconnected and intertwined by fibrils of said polytetrafluoroethylene to impart a self-sustaining condition and flexibility to the non-woven material, and additionally containing from about 40 to 60 percent by volume of the non-woven material to grease, said grease having a viscosity between about 10 to 1000 poises at temperatures between about 10 and 150° C. and being uniformly distributed throughout the non-woven material, said non-woven material having been prepared by mechanically working a mixture of said particulate material, polytetrafluoroethylene and grease until fibrillation of the polytetrafluoroethylene occurs and the resulting fibrils interconnect and intertwine the particulate material.
Claim 3
Dependent Claim
21 words
The material according to claim 1 which has been compressed, particulate material therein being interlocked whereby resistance to creep is increased.
Claim 4
Dependent Claim
12 words
The material according to claim 1 wherein the particulate material is graphite.
Claim 5
Dependent Claim
21 words
The material according to claim 1 wherein the particulate material is a metal, intermetallic compound, ceramic, salt, plastic or combinations thereof.
Claim 6
Dependent Claim
20 words
The material according to claim 1 wherein the grease comprises a mineral or synthetic lubricating oil and a thickening agent.
Claim 7
Dependent Claim
51 words
A method of making the nonwoven material according to claim 1 which comprises mechanically working a mixture of the particulate material, polytetrafluoroethylene and grease until fibrillation of the polytetrafluoroethylene occurs and the resulting fibrils interconnect and intertwine the particulate material to impart a self-sustaining condition and flexibility to the nonwoven material.
References Cited (Backward Citations)
US2752321A
Cited
US3315020A
Cited
US3556161A
Cited
US3407249A
Cited
US3864124A
Cited
US3678145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |