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:
Aug. 16, 1988
Filed:
Jun. 15, 1987
Rolf E Kowalewski, Palatine, IL (US);
Charles J Schmitz, Arlington Heights, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A circuit is described for timing the intermittent use of an appliance, wherein the appliance includes a usage signal for indicating that the appliance is in use. The circuit includes a battery, and a resistive network, coupled to the battery, for draining power from the battery such that the power level thereof decreases to a threshold level over a selected timing interval. The circuit further includes a switch, responsive to the usage signal, for selectively enabling the resistive network, and a battery level threshold detector, responsive to the battery reaching the threshold level, for indicating that the timing interval has lapsed, thereby alerting the operator that the appliance should be serviced, which service includes replacement of the low cost battery.