Nippon Mitsubishi Oil Corporation

National Tax Administration Agency

Wakabayashi & Co.

Toh Zinc Company Limited

Takeo Koizumi

Kazuhiro Yagishita

Jinichi Igarashi

Kiyoshi Yoshizawa

Kikuo Nojiro

Katsuyoshi Mitsutomi

Katuo Ehara

Yasusuke Wakabayashi

Kenichi Otsuka

Seiji Nakamura

Masataka Hara

Masahiro Ehara

Lubricating oil compositions

The invention involves the detection of odors using an odor detector including an n-type semiconductor sensor having an electric resistance responsive to odor molecules adsorbed thereonto. An ozonizer is provided within a test compartment to contact the detector with an ozone gas for the purpose of calibrating the detector to an initial zero setting. The test compartment also includes a ventilation fan operable to draw purging air into the compartment. In order to minimize the time required to bring the detector to the initial zero setting, a computer is used to selectively actuate the ozonizer and the ventilation fan in a controlled manner. Before starting a new detection cycle, an operator selects a specific table of optimal pattern for quick recovery to the zero setting from among a plurality of tables stored in the computer, based on certain factors such as the identity and concentration of previously detected odorant substances, etc.

Method and apparatus for detecting odors

Newly isolated yeasts assimilating a high amount of protein are added to a waste water rich in protein thereby making such yeasts assimilate protein, so that the B.O.D. of the waste water is efficiently decreased.

Method of treating a waste water rich in protein

Growing community of inventors

Yokohama, Japan

Takeo Koizumi