LONDON – Analog Devices Inc. has said that U.S. International Trade Commission has ruled patents belonging to Knowles Electronics LLC invalid. As a result Administrative Law Judge Robert K. Rogers Jr. has quashed attempts to stop ADI from importing or selling its microphones in the United States.
The ruling followed his order of March 24 that denied Knowles request for temporary relief, said ADI (Norwood, Mass.). The rulings are in line with those of the U.S. Patent and Trademark Office, which in separate re-examinations, has rejected all of Knowles' asserted claims as invalid, ADI said.
"Since bringing our first MEMS microphone products to market in 2008, ADI has maintained our focus on innovation and providing the highest performance MEMS microphones available," commented Mark Martin, Analog Devices' vice president of MEMS and sensor technology group, in a statement.
Separately, Analog Devices has sued Knowles for shipping microphone products which infringe ADI's patented wafer anti-stiction application (WASA) process. Judge Rogers is expected to rule on the WASA case on or before Jan. 4, 2011.
The Emkay Innovative Products division of Knowles Electronics (Itasca, Ill.) introduced its microphone based on silicon MEMS technology in February 2003.