Back to results
US 4,612,237 AGranted
Hydraulically entangled PTFE/glass filter felt
AssigneeE. I. Du Pont de Nemours and Company
InventorPeter E. Frankenburg
Life of this patent
Estimating the term…
Abstract
A non-woven felt suitable for use as a filter comprised of poly(tetrafluoroethylene) and glass fibers hydraulically entangled to a supporting scrim and a process for making said felt are disclosed. The scrim is made from high temperature and chemically resistant materials.
Claims31
A felt having a basis weight of 150-600 g/m.sup.2 suitable for use as a filter comprising:
- a uniformly dispersed sheet-like structure containing 40-95 percent by weight poly(tetrafuoroethylene) fibers having a linear density per filament of 3-8 dtex, 5-60 percent by weight glass fibers having a linear density per filament of 0.2-1.5 dtex, hydraulically entangled into supporting scrim.
Dependencies are inferred from the claim text.