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. 11, 1981
Filed:
Jun. 04, 1979
Charles W Chambers, Jr, Downers Grove, IL (US);
Tellabs, Inc., Lisle, IL (US);
Abstract
An improved current source circuit is adapted for use with two-wire transmission systems of the type encountered in telephony, and has excellent common mode noise rejection. In its various embodiments, the current source provides an interface for coupling signals with a telephone pair, operates to cancel or negate the effect of unwanted impedances on the pair, generates a selected impedance across the pair, and functions as an electronic hybrid circuit for interfacing between a two and a four-wire telephone transmission facility, all while affording common mode rejection to noise on the line. In addition, the various embodiments of the current source are combined into an improved terminating set for a two to four-wire telephone transmission facility.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile