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:
Apr. 20, 1982
Filed:
May. 13, 1980
Applicant:
Inventor:
John A Bushman, London, GB;
Assignee:
Neotronics Limited, Bishops Stortford, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ; G01N / ;
U.S. Cl.
CPC ...
340632 ; 73 23 ; 2041 / ; 324 / ;
Abstract
A gas detecting device e.g. for detecting CO.sub.2 in air, has a vessel containing water and a layer of ion-exchange resin wetted by the water and sandwiched between air and water-permeable electrode gauze discs. Any CO.sub.2 in the ambient atmosphere dissolves in the water and the dissociated ions lower the resistance between the electrodes which may be connected to a bridge circuit adjusted to be out of balance at a predetermined CO.sub.2 concentration or which may be of dissimilar metal to form a galvanic cell with a measurable output current at a predetermined CO.sub.2 concentration.