Author(s): LUO Xiao-ning, YAN Chun-gen, YANG Yue, Jingdezhen Ceramic Institute Library, Ceramic Intellectual Property Information Center of Jiangxi Province
Pages: 113-118
Year: 2015 Issue:  2
Journal: Chinese Rare Earths
Keyword:  rare earth permanent magnet; magnetic materials; patent information; analysis;
Abstract: The Patent Information Analysis System of Intellectual Property Publishing House was utilized in order to investigate the patent status of rare earths permanent magnetic material. Patent applications of rare earth permanent magnetic material released(announced) by Chinese State Intellectual Property Bureau from 1985 to 2013 were analyzed in respect to overall trend of application volume,distribution home and abroad,distribution of patent legislation,patent applicant and technology field concerned. Results indicated that: application volume took a rising trend; invalid patent represented a significant percentage; Japan,America and other nations filed most patents; applications in China were mainly filed by developed areas; technological innovations were mainly made by colleges and institutes in China while patent applications were mostly filed by enterprises in Japan; top 10 subclasses of the International Patent Classifications(IPC) were H01 F,H02K,B22 F,C22C,B03 C,C23C,C22 B,C25D,B24 B,and G01 R. It is suggested that: an improved patent strategy for rare earth permanent magnetic materials is needed; heavy rare earths in rare earth permanent magnetic material should be reduced; study on magnetism uniformity should be strengthened and nanocomposite rare earth permanent magnetic material research should be conducted.