Tokuriki Honten Co., Ltd.

Fuji Electric Co., Ltd.

Sankyo Company, Limited

Sadao Sato

Kiyoshi Sekiguchi

Akihiro Takahashi

Takashi Nara

Mutsuo Nakajima

Kohei Furuya

Tatsuo Haneishi

Seigo Iwado

Hiroshi Hikita

Hisaji Shinohara

Kiyoshi Koi

Mitsuo Sunaga

Hideo Kumita

Kenichi Kamiura

Kohei Tsuda

Mitsuo Yamasita

Kunio Shiokawa

Although an Ag&#x2014;CdO-based material has excellent electric properties such as deposition resistance, arc resistance and low contact resistance, which are required for an electric contact, the discharge standard provision in Japan, EC Directive on Waste from Electrical and Electronic Equipment (WEEE) and the like have been directed toward disuse of Cd, as already known. Thus, the present invention is characterized in that after an atmosphere in a pressured oxidation furnace is replaced with oxygen, the temperature of an internal-oxidative Ag alloy prepared under a condition of a cold roll rate of 50 to 95% is gradually raised from a temperature of 200&#xb0; C. or less in a pressured oxygen atmosphere with an oxygen pressure of 5 to 50 kg/cmand internal oxidation processing is performed with an upper limit temperature of 700&#xb0; C., thereby restraining an Ag-rich layer generated on an outermost surface and an oxide-flocculated layer immediately below the Ag-rich layer and uniformly and finely precipitating and dispersing a composite oxide of added elements to a deep part of an internal structure.

Method for manufacturing ag-oxide-based electric contact material and product of the same

An electric contact with a base metal used as a switch wherein the non-welded peripheral portion of the contact is prevented from bow-like bending and from peeling off. The electric contact with a base metal having a contact promoting shape is formed by die forging of a contact material joined to the base metal by resistance welding. The composite contact material is prepared by coating the core material of Ag-oxide contact material with non-oxide contact material. The side of the material in contact with the base metal is of non-oxide contact material. The contact material may be pressed to fill a groove preformed in the base metal, welded to protrusions preformed in the base metal, welded to the bottom of a cut preformed in the base metal, or welded to bottoms of recesses preformed in the base metal.

Electric contact with base metal

A novel compound named 'cornexistin' has the formula (I): ##STR1## and it and the corresponding ring-opened diacid and salts thereof have herbicidal and growth regulating effects. Cornexistin can be prepared by cultivation of a microorganism of the genus Paecilomyces, e.g. Paecilomyces variotii Bainier SANK 21086.

Anhydride herbicides

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Tokyo, Japan

Sadao Sato