The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1987
Filed:
May. 27, 1986
Masayoshi Moriwaki, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic disc cartridge contains a pair of dust liners sandwiching the magnetic disc. Each liner has a double layer construction consisting of an outer layer and an inner layer. The outer layer is an unwoven cloth layer which has a high surface resistivity, which is electrostatically chargeable, and which attracts and absorbs dust particles, while the inner layer, which faces the disc, is apertured and is impregnated with a surface agent to produce a much lower surface resistivity to preclude a static charge, so that, during dynamic operation of the disc, the differential charge that exists in the inner/outer layers causes dust particles to pass through the apertured inner layer and become entrapped in the charged outer layer.