The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 17, 1987
Filed:
Jan. 15, 1986
Hans Matthiessen, Gross Parin, DE;
Jorg Winkler, Stockelsdorf, DE;
Dragerwerk Aktiengesellschaft, Lubeck, DE;
Abstract
A gas measuring and warning apparatus is disclosed having a testing tube through which the gas that is to be detected flows. The apparatus also has a photoelectric scanner for detecting the migrating reaction zone. The configuration of the apparatus is simplified and the resolution capacity is improved. This is achieved in that the photoelectric scanner includes an image forming lens system which forms an image of the length of the reaction zone on a photosensitive array of identical sensor elements, the reaction zone being illuminated by at least one light source. For emitting a measured signal, the evaluation circuit is controlled by the number of sensor elements that are located within the imaged length of the reaction zone.