Patent USRE28283 - THRESHOLD CIRCUIT FOR TONE-RINGER OR LIKE LOAD MEANS

Patents

Inventors: Richard C. Foss, Richard C. Foss
Current U.S. Classification: 379/414; 379/373.01

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Citing Patent	Filing date	Issue date	Original Assignee	Title
US4196317	20 Jan 1978	1 Apr 1980		Telephone intercom system
US4346265	17 Dec 1979	24 Aug 1982	Texas Instruments Incorporated	Annunciator
US4367376	17 Sep 1980	4 Jan 1983	Proctor & Associates Co.	Electronic telephone ringer including anti-bell tap provisions
US4893332	29 Apr 1988	9 Jan 1990	Aquatrol Corporation	Low-powered remote sensor