Gas detector

Abstract

A gas detector of the type using an electric heater in which a substrate consists of an upper film of electrically insulating substance having a resistance to heat and a lower film of substance different from the substance of the upper film, a recess is formed below or under the upper film by removing part of the lower film, and a film of electrically conductive substance is deposited over the bridge of the upper film across the recess in the lower film, thereby providing a heating element characterized in that said heating element consists of a film of a substance having catalytic effects in the presence of a gas to be detected deposited on said electrically conductive substance or a material responsive to a gas to be detected, or consists of said electrically conductive substance having catalytic effects in the presence of a gas to be detected or a substance containing said substance having catalytic effects in the presence of a gas to be detected or a substance responsive to a gas to be detected, and said heating element is exposed to a gas to be detected.

Dependencies are inferred from the claim text.