Japan Oxygen, Co., Ltd.

Nippon Sanso Kabushiki Kaisha

Nihonsanso Kabushiki Kaisha

Hiroshi Morishita

Akihiro Nakamura

Terukazu Imayoshi

Hitoshi Kikuchi

Hiroshi Yokota

Hiroshi Ishii

Toshiaki Yamazaki

Koji Seki

Minoru Morita

Hiroshi Namikawa

Nobuyoshi Ito

Takashi Fukano

Kohji Seki

Kiyoshi Ohno

Shin-Ichi Miyake

Youji Koguchi

A process for the production of a glass by the vacuum melting method using silica as a raw material is disclosed, comprising filing a silica fine powder in a suitable vessel, heating it in the presence of an accelerator for phase conversion to obtain a porous formed body consisting of a cristobalite phase, and then heating and melting the formed body in vacuo. According to the present invention, a transparent and active glass having a high quality can be produced at an inexpensive cost.

Process for the production of glass

Leakage detection method using helium

A heat insulated tank is disclosed having inner and outer walls between which a supporting material is interposed. The material comprises a molding of alkaline earth metal silicates or a molding of composite material based thereon having a continuous open cell structure and subjected to heat treatment under vacuum. Inside and outside faces of said supporting material are provided with a suitable number of grooves. The entire surface of said supporting material is impregnated with a solution of sodium silicate, potassium silicate or ethyl silicate and subjected to baking. The supporting material has a high insulating capability and a high resistance to compression, thus it is applicable to square shaped tanks in addition to conventional spherical or cylindrical ones. The tank is easy to manufacture with increased storage capacity.

Heat insulated tank

Growing community of inventors

Kawasaki, Japan

Hiroshi Morishita