It’s common for engineers who invent a new technology while working for a tech company to forfeit the patent rights to their employers. But a new federal suit involving Fish & Richardson could test whether law firms are entitled to those same ownership rights when one of their partners also happens to be an inventor.

The suit by patent holding company Illinois Computer Research says Fish & Richardson used improper tactics to make ICR’s patent claims against Google go away. ICR sued Google last month and added Fish as a co-defendant last week.