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:
May. 25, 1976
Filed:
May. 10, 1974
William C Tipton, Newark, NJ (US);
Michael Suchomel, Mountainside, NJ (US);
John Z Taran, Morristown, NJ (US);
General Signal Corporation, Rochester, NY (US);
Abstract
An ionization-type fire detector having a pair of ionized chambers, one of which is arranged so that products of combustion can flow therethrough while the other is substantially isolated from the products of combustion. As a result, when combustion products are present, the electrical conductivity in one chamber is different than the other, and this condition is sensed to provide a fire alarm signal. The first-mentioned ionized chamber is defined by inner and outer shells of plastic material which are suitably spaced from each other and with the inner surface of the outer shell being provided with a conductive coating. The spaced plastic surfaces are curved, and one of the shells defines a cavity which forms at least a part of said first-mentioned chamber. It has been found that this minimizes the adverse effects caused by wind drafts which otherwise can affect the electrical conductivity in the first chamber and provide an erroneous fire alarm signal. The overall arrangement of the detector is such as to provide a compact unit which is attractive in appearance and relatively low cost to manufacture.