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. 27, 1985
Filed:
Aug. 24, 1983
Jacob Fraden, Hamden, CT (US);
Healthcheck Corporation, Cheshire, CT (US);
Abstract
An improved power switch circuit for turning on manually and for turning off either manually or automatically a battery operated electronic instrument. The circuit includes one manual momentary contact on/off switch, a bilateral switch or transmission gate, a microprocessor, and a capacitor that charges to a threshold level when the on/off switch is momentarily closed (on) and that discharges when either the on/off switch is momentarily closed again (off) or after a fixed amount of time has elapsed as determined by the microprocessor. The bilateral switch is switched on when the threshold potential is reached thereby preconditioning the on/off switch for turning the instrument off. The on/off switch can now be closed to discharge the capacitor or the microprocessor can discharge the capacitor thereby switching off the bilateral switch and preconditioning the on/off switch for again turning on the power to the electronic instrument.