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. 28, 1978
Filed:
May. 16, 1977
Gregory A Bertone, Monroeville, PA (US);
Mine Safety Appliances Company, Pittsburgh, PA (US);
Abstract
A voltage regulating circuit is provided for low voltage battery-powered measuring instruments of the type using electrically-heated filaments as sensing elements. The circuit includes an indicating signal light which is energized from a separate control power source and controlled by the voltage regulating circuit and also in response to energization of a filament in the instrument. The light is turned OFF in case of failure of the control power or of inability of the voltage regulating circuit to maintain the desired voltage. The light is also turned OFF for a set time period upon energization of the filament to allow the filament to stabilize at its normal temperature. Thus, when the indicator light is ON an indication is provided that the instrument is in condition for use.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile