File Name: BYD_auto_patents

Observations: 1,294

Description:

As explained in the separate web appendix, we give special treatment to the indendent Chinese automaker BYD. The reason is that in addition to being an automaker, it also makes rechargable batteries for cell phones, and many of its patents are for its cell phone business. For the results reported in the paper, we include only patents that we attribute to its auto business. To separate these out, we first took the patents owned by foreign auto producers in China and selected the first listed IPC classification for each patent, at the three digit level. We took the top 15 3-Digit classifications, and these accounted for just over 90 percent of all the foreign automaker patents in China. The file BYD_auto_patents contains all BYD patents published 2005-2010 for which one of the listed three-digit IPC codes is in the list of top 15 3-digit auto classifications.

Variables

Variable	Type	Len	Columns in Ascii File	Description
app_numfix	Char	12	1-12	Unique index for each patent record