Textured, porous, expanded PTFE
US5466509A · kind A · utility
89Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1993 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Jan 15, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A more porous PTFE is obtained by impressing a pattern into extruded PTFE and then expanding the PTFE. The pattern can be impressed by knurling or, preferably, by rolling the sheet between rollers having a pseudo-random pattern formed on the surface of the roller. The uniformity of the pores is controlled by the pattern; viz. a coarse pattern produces a wider distribution of internodal distances than a finer pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.