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:
Feb. 09, 1999
Filed:
Aug. 07, 1997
Curtis William Fisher, Sterling, IL (US);
Einar Trygstad, Sterling, IL (US);
Wahl Clipper Corporation, Sterling, IL (US);
Abstract
Apparatus indicates a charge on a battery that has a predetermined operating range. The apparatus includes a thermochromatic material for displaying the charge level of the battery, and a resistive heating device, which is in thermal contact with the thermochromatic material, for generating heat for activating the thermochromatic material. A controlling device which is connected to the resistive heating device is also included for controlling the heat generated by the heating device so that the thermochromatic material has sufficient resolution to indicate the charge on the battery over a substantial portion of the thermochromatic material.