Patent ID: 8198761

Claim:
A magnetic drive motor comprising: a) a housing; b) a plurality of cylinders bored in said housing, each of said plurality of cylinders having at least an upper end; c) a piston reciprocatingly received within each of said plurality of cylinders; d) a cylinder head covering said upper end of each of said plurality of cylinders; e) an electromagnet secured within each said cylinder head; f) a source of electrical energy coupled with each said electromagnet for delivering electrical energy to each said electromagnet; g) means for controlling delivery of electrical energy to each said electromagnet such that when said electromagnet receives electrical energy, said electromagnet produces a magnetic force which impinges upon said piston, urging said piston toward said electromagnet; h) a magnetic shield within each of said cylinders, each said magnetic shield actuatable between a first position shielding said piston from the magnetic force produced by said electromagnet and a second position exposing said piston to the magnetic force produced by said electromagnet; i) said magnetic shield is formed of an inorganic material; j) said magnetic shield is in the form of a plate; k) said inorganic material is polymeric material; l) said polymeric material is a plastic material; and m) said magnetic shield contains a material forming a receptor for magnetic flux fields generated by said electromagnet.