Title: Electronic tone ringer

Abstract: An electronic tone ringer for a telephone set produces a tone in response to the presence of a conventional a.c. ring signal between the tip and ring leads of the telephone set. The electronic tone ringer rectifies the ring signal to produce a d.c. voltage. The resulting d.c. voltage is connected to a sounding device through a timing circuit which filters out short duration line transients.

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Inventors: Ouimet, Donald J. (Vernon Hills, IL, US)
Gilreath, Richard D. (Roundlake Beach, IL, US)

Application Number: 833054
Filing Date: 1977-09-14
Publication_date: 1979-02-20
Assignee: Telephone and Data Products (Madison, WI)
Primary Class(es): 379/375.01
Other Classes:
US Patent Ref:

3278687	Oct, 1966	Everett	179/17.
3466403	Sep, 1969	Combridge	179/84.

Other Refs: 146230821428581318870

Mar, 1969	DE
Aug, 1971	DE
May, 1973	GB

Primary Examiner: Claffy, Kathleen H.
Assistant Examiner: Popek, Joseph A.
Attorney: Leydig, Voit, Osann, Mayer & Holt, Ltd.