Fuji Xerox Co., Ltd.

Powdertech Co., Ltd.

Nippon Iron Powder Co. Ltd.

Hiroshi Endo

Akihiko Noda

Kazuo Terao

Hidekiyo Tachibana

Yukio Seki

Ryuichi Kodama

Toshitaka Wada

Toshio Yokobari

Shigeru Tanaka

Toshio Honjou

The oxygen detecting device () of the present invention includes an oxygen detector sheet having a sheet carrier () having a porous inorganic material filled therein which has been impregnated with an oxygen detecting fluid, and a film () having a predetermined oxygen transmittance for covering and sealing the sheet carrier (). Since the sheet having the porous inorganic material filled therein is adopted, the oxygen detecting device has an excellent light resistance, leading to clear recognition of coloration for a long period of time. Because of excellent light resistance, the device keeps excellent property even after long exposure to a fluorescent lamp in a display case for displaying foods. Thus the device is suitable for checking quality of commercial products.

Oxygen detector sheet and oxygen detecting agent using the same, and method for manufacturing oxygen detector sheet

A carrier of developers composed of a composition represented by (MO).sub.X (Fe.sub.2 O.sub.3) having bulk density of 1.8-3.4 g/Cm.sup.3 and magnetization of 10-30 emu/g in a magnetic field of 450-1000 O (oersted), where M is at least one metal selected from the group comprising lithium, manganese, nickel, zinc, cadmium, copper, cobalt, and magnesium.

Magnetic carrier of developer for electrophotographic copying machines

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Chiba, Japan

Hiroshi Endo