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:
Apr. 29, 2008
Filed:
Jun. 17, 2005
Jimmy D. Claiborne, Scottsville, KY (US);
Jimmy D. Claiborne, Scottsville, KY (US);
Heathco LLC, Elmhurst, IL (US);
Abstract
A doorbell detection and playback circuit for a doorbell pushbutton connected to an alternating current power source comprises at least one bridge rectifier circuit coupled to the power source through a diode placed in parallel with the pushbutton. The bridge rectifier circuit generates a signal at a first frequency when the pushbutton is not depressed, and generates a signal at a second frequency when the pushbutton is depressed. A frequency detection circuit is included and is coupled to the signal from the bridge rectifier. The frequency detection circuit further comprises an output responsive to the presence of a signal at the second frequency coupled to a sound generator for playing a ring tone or series thereof.