Sintered plastic articles

Claim 1

AN ARTICLE OF MANUFACTURE COMPRISING A RESINOUS PLASTIC BACKING MEMBER AND AN OVERLYING MEMBER OF POLYTETRAFLUOROETHYLENE MECHANICALLY AND ADHESIVELY BONDED THERETO, SAID POLYTETRAFLUOROETHYLENE MEMBER HAVING A RELATIVELY LOW COEFFICIENT OF FRICTION AND BEING RELATIVELY CHEMICALLY INERT, MEANS DEFINING A MULTIPLICITY OF APERTURES OVER SUBSTANTIALLY THE ENTIRE SURFACE OF SAID RESINOUS PLASTIC BACKING MEMBER WHICH FACES SAID POLYTETRAFLUOROETHYLENE MEMBER, SAID APERTURES IN SAID RESINOUS PLASTIC BACKING MEMBER HAVING A DEPTH LESS THAN THE CROSSSECTIONAL THICKNESS DIMENSION OF SAID RESINOUS PLASTIC BACKING MEMBER, A MULTIPLICITY OF PROJECTIONS OVER SUBSTANTIALLY THE ENTIRE SURFACE OF SAID POLYTETRAFLUOROETHYLENE MEMBER FACING SAID RESINOUS PLASTIC BACKING MEMBER AND RECEIVED BY THE APERTURES IN THE SURFACE OF SAID RESINOUS PLASTIC BACKING MEMBER, SAID PROJECTIONS HAVING A DENSITY AT THE TIP AND BASE THEREOF GREATER THAN THAT AT THE MIDSECTION, EACH SAID PROJECTION HAVING A CROSSSECTIONAL DIMENSION AT THE MIDSECTION WHICH IS LESS THAN THAT AT THE TIP AND BASE THEREOF, AND AN ADHESIVE INTERPOSED BETWEEN THE FACING SURFACES OF SAID MEMBERS, SAID PROJECTIONS AND APERTURES COOPERATING WITH SAID ADHESIVE TO PROVIDE A MECHANICAL AND CHEMICAL BOND MAINTAINING THE FACING SURFACES OF SAID MEMBERS IN INTIMATE CONTACT THROUGHOUT THE ENTIRE EXTENT OF FACING CONTACT THEREOF.