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. 15, 1995
Filed:
Dec. 27, 1994
Artur Bardl, Munich, DE;
Emil Navratil, Munich, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A ringer circuit includes a rectifier unit receiving a calling alternating voltage and having first and second output terminals. An acoustic transducer has first and second terminals. A controllable first switch is connected between the first output terminal of the rectifier unit and the first terminal of the acoustic transducer. A controllable second switch is connected between the first and second terminals of the acoustic transducer. A capacitor is connected between the second terminal of the acoustic transducer and the second terminal of the rectifier unit. A switch control is supplied from the capacitor for opening and closing the first and second switches in alternation and in phase opposition to one another as a function of the calling alternating voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile