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, 1978
Filed:
Oct. 03, 1977
Applicant:
Inventor:
Edward Lloyd Henderson, Kanata, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
179 / ; 361 91 ;
Abstract
A circuit for controlling the on-off ringing of a line powered electronic tone ringer in a telephone set. The circuit, which includes a variable rate charge-discharge suppression circuit, effectively prevents up to 300 volt peak, 12 Hz transient spikes on the line from actuating the tone ringer, yet still responds to a 35 volt RMS, 18 Hz ringing signal.
Henderson, Edward. (1978). Electronic tone ringer control circuit for a telephone set (U.S. Patent No. 4107476). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4107476
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile