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:
Jan. 04, 1983
Filed:
Sep. 17, 1980
D Frederic Proctor, Redmond, WA (US);
Darrell D Cole, Newberg, OR (US);
Proctor & Associates Co., Redmond, WA (US);
Abstract
An electronic ringer circuit suitable for use as a replacement for, or an alternative to, the electromagnetic ringer of a telephone set and other station apparatus is disclosed. To eliminate bell tap, each of the disclosed arrangements includes a load impedance that is connected across the output terminals of a rectifier-power supply stage until an acceptable ringing signal is detected. The load impedance is then disconnected and the signal provided by the rectifierpower supply stage activates a tone generator stage that drives a piezoelectric transducer. Various arrangements are provided, including configurations for single-party bridged ringing installations, multi-party divided ringing installations, coded ringing for use in situations wherein a number of stations are located in the same acoustic environment, and a multi-line installation such as a small key telephone installation.