If you are interested in working with historical German data, this special issue of the German Economic Review gives an overview of existing research and available dataset, including our article on patent data (co-author: Jochen Streb):

www.degruyter.com/journal/key/...

of patent conflicts across industries. Our results reveal a significant heterogeneity. By introducing the new concept of technological concentration, we show that in industries with high technological concentration (HHI) patent litigation was less frequent.👇 3/