HISTORY
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 1952-1998 The compound semiconductor research section of GRINM(General Research Institute for Non-ferrous Metals.)
 
1999.3 The subsidiary compound semiconductor and Ge factory of GRITEK(GRINM Semiconductor Materials Co.,Ltd)
 
1999.12 The subsidiary Ge factory of GRITEK(GRINM Semiconductor Materials Co.,Ltd),the Guorui Electronic Materials Co.,Ltd. established.
 
2000.6 The subsidiary compound semiconductor factory of GRITEK(GRINM Semiconductor Materials Co.,Ltd),the Beijing Guojing Infrared Optical Technology Co.,Ltd. 
 
2010.12 Beijing Guojing Infrared Optical Technology Co.,Ltd.and Guorui Electronic Materials Co.,Ltd.were merged to be GRINM Electro-optic Materials Co.,Ltd. 
 
2015.7 Part of the industry of GRINM Electro-optic Materials Co.,Ltd. is divided and established to be GRINM Guojing Advanced Materials Co.,Ltd.