Patent ID: 6877419

Claim:
A composite diaphragm for diaphragm pumps comprising: a) an elastomer body shaped as a circular disk, the body comprising: i) a dish edge having a clamping area; ii) a bottom section; iii) a flexible diaphragm section connecting said dish edge with said bottom section; iv) a plurality of naps disposed on said elastomer body, said naps being configured as convex spherical segments which reinforce the diaphragm section at certain points, wherein in a radial direction, the naps are arranged on lines that run through a center point of the circular disk, lined up on said lines and spaced apart; and b) a polytetraflouroethylene (PFTE) coating disposed on a product side of the body, said coating being in a form of a plane ring surface in an area of said flexible diaphragm section, wherein said naps are coated by said coating and form elevations in said coating.