Electret article
AssigneeMitsui Petrochemical Industries, Ltd.
InventorsKazuyuki Yamasaki, Fukashi Kagawa
Life of this patent
Estimating the term…
Abstract
An electret article comprising an even number of electret plastics films laminated together, with the surfaces of the same polarity facing each other, said laminate having the same polarity on both external sides. It keeps its high surface charge density. It will find use in such applications as acoustic materials, filters, and medical supplies.
Claims10
An electret article comprising a laminate of a plurality of electret plastics films, said films being laminated together, the number of films in said plurality of films being an even number, with the juxtaposed internal surfaces of said films facing each other within said laminate being of the same polarity, said laminate having the same polarity on both external surfaces, each of said films having opposite polarities on opposite surfaces.
Dependencies are inferred from the claim text.