Daikin Kogyo Co., Ltd.

Horiba, Ltd.

Mitsuhiro Okamoto

Norimasa Honda

Junichi Sako

Hideo Tokunaga

Toshirou Hoshino

Syozo Matumoto

The present invention relates to a solvent primarily composed of a low polymer of chlorotrifluoroethylene for the extraction of an oil fraction in water and measuring the concentration of the oil fraction in water by solvent extraction in the infrared absorption method. The low polymers of chlorotrifluoroethylene contemplated as a solvent herein may be a single polymer or a mixture of polymers of different degrees of polymerization as shown in the following formulae: ##STR1## WHEREIN BOTH ATOMS REPRESENTED BY X in the first chemical formula are the same or different from each other and X is a chlorine or fluorine atom, and n is 2 or 3.

Solvent for the extraction of oil fraction in water

A heating tube adapted to electrically heat a fluid carried therethrough includes an inner tubular layer of polytetrafluoroethylene, a second tubular layer surrounding the inner layer and being formed of a homogeneous mixture of polytetrafluoroethylene and electrically conductive carbon, and a third layer surrounding the second layer and being formed of polytetrafluoroethylene. The three layers are coextruded together. The third layer is cut away at at least two circumferential points and the exposed second layer is there provided with a sintered coating for finely divided silver and finely divided polytetrafluoroethylene. The sintered coating is then wrapped with a silicone resin tape containing dispersed silver particles and a metal ring is then fitted over the silicone resin tape thereby forming an electrical terminal for the heating tube.

Electric heating tube

Growing community of inventors

Neyagawa, Japan

Mitsuhiro Okamoto