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:
Apr. 07, 2009
Filed:
Oct. 19, 2005
Applicant:
Kelly C. Casey, Flower Mound, TX (US);
Inventor:
Kelly C. Casey, Flower Mound, TX (US);
Assignee:
Littlefuse, Inc., Des Plaines, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H 9/04 (2006.01); H02H 1/04 (2006.01); H02H 3/22 (2006.01); H04M 1/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A bipolar semiconductor overvoltage protection circuit presents less capacitance to a communication line. The overvoltage protection circuit includes an overvoltage protection device that is biased with a voltage to not only reduce the capacitance thereof, but also to reduce the change in capacitance as a function of frequency. Changes in communication line voltages thus change the capacitance of the overvoltage protection device less, resulting in the ability to allow the transmission of high capacity data protocols with reduced error rates.