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:
Feb. 26, 2013
Filed:
Dec. 10, 2008
Laigui Qin, Sichuan, CN;
Donald Edward Becker, Bradenton, FL (US);
William Edwards, Bradenton, FL (US);
Baohua Shu, Shanghai, CN;
Wei Chen, Shanghai, CN;
Laigui Qin, Sichuan, CN;
Donald Edward Becker, Bradenton, FL (US);
William Edwards, Bradenton, FL (US);
Baohua Shu, Shanghai, CN;
Wei Chen, Shanghai, CN;
UTC Fire & Security Americas Corporation, Inc., Bradenton, FL (US);
Abstract
A differential transformer-free hybrid circuit includes a first amplifier configured to receive a first signal from a transmitter and output the first signal to a telephone loop, and a second amplifier configured to receive a second signal from the telephone loop and output the second signal to a receiver. Further, the differential transformer-free hybrid circuit also includes at least one balanced network element and a transformer-less interface configured to couple the first amplifier and the second amplifier to the telephone loop, wherein the transformer-less interface includes at least one current blocking device.