Multi-national patents and applications data, based on filings in patent authorities worldwide, are used as a means to
probe corporate and national R&D roles in the emerging LED and SSL industries. The data are counts of patents,
applications, or applications filed in at least two patent authorities, and do not have means to control for the importance
of individual patents. Nonetheless they provide a helpful way to assess the companies and nations involved in LED and
SSL research in general and in specific technological sub-domains. Some of the leading companies and nations are
reported on. The data show Samsung's rapid rise to prominence in these technologies. They indicate a greater role of
nations other than the U.S. than has been noted in previous patent analyses, since the tendency of applicants to file
predominantly in their home countries has meant that counts based solely on U.S. patents have missed large numbers of
non-U.S. applicants active in this technology while still counting U.S. applicants that filed solely in the U.S. They reveal
growing activity in Asia, partly in Korea because of Samsung's role, and partly in Taiwan and mainland China.
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