Abstract: It always remains difficult howto certify and measure the patent thicket, which means many and overlapping patents in a dense network, and the enterprises which seek new technology for commercialization must be licensed by more than one patent owners. As the patent documents filed to the Patent Office of P.R.Care not required to introduce the cited relationshipamong patents,all the foreign measurement methods which are extensively applied to measuring the patent thicket are not suitable for our country. This paper takes LED packaging technology patents from 1997 to 2010 in China as an example, uses comprehensively the methods ofPareto law, the proportion method and prime lawmeasure, and the research shows that the LED packaging technology patents have illustrated a fragmentation tendency in China.

Key words: patent thicket, LED packaging technology patents, patent fragmentation