Patentee Estoppel Can Shut Down Related Prosecution
Patent prosecutors might consider PTAB estoppel a pure post-grant concern. That is, a litigation issue restricted to district courts after a failed PTAB challenge, or an issue raised in the context of a second-bite at the PTAB apple. But, PTAB estoppel can effect both failed petitioners and unsuccessful patent owners. Patent owner estoppel, often overlooked, is only now beginning to impact patent prosecution.