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:
Dec. 09, 1980
Filed:
Nov. 29, 1978
Louis F Grein, Stow, MA (US);
John L DuBois, Boxborough, MA (US);
Enertron Corporation, Waltham, MA (US);
Abstract
A fast acting, temperature responsive apparatus provides a visual output representing a temperature difference. The apparatus is battery-operated and hand-held, and employs a low thermal mass thermistor, protectively housed in a hand-held probe, and an electrical circuit responsive to temperature differences registered by the thermistor. The circuit is 'zeroed' or preset by a manually adjustable first panel control to the ambient temperature and any temperature change at the thermistor, relative to the preset ambient temperature, is visually indicated to the device user. The apparatus thus advantageously detects heat leaks, for example in the home.