Panasonic Corp. racked up the most valuable patents in the year ended March 2010, according to a ranking by Tokyo research firm Patent Result Co.
Panasonic secured the top spot because it registered the highest number of patents with the Japan Patent Office in fiscal 2009, including some valuable ones, such as a patent related to an electrode material for lithium ion secondary batteries.
Toyota Motor Corp. ranked second, thanks partly to patents on a high-precision car-navigation system and a vehicle structure for electric automobiles.
Despite registering the smallest number of patents among the top 10 firms, Sharp Corp. (6753) came in fifth. This is because the company secured highly valuable patents, including one for an online payment settlement system that is expected to help make e-books popular.
Denso Corp. was the biggest gainer among the top 10 firms, climbing from ninth in fiscal 2008 to seventh. The company's rise was helped by a patent on air conditioning systems for hybrid vehicles.
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