Omnipharm v Merial [2011] EWHC 3393 (Pat)
Led by Henry Carr QC against the patentee. The action concerned two patents for fipronil-based formulations used as anti-flea treatments on pets. One patent was held invalid, the other not infringed. Both decisions were upheld on appeal.
Omnipharm v Merial [2011] EWHC 3393 (Pat) and costs Omnipharm v Merial [2012] EWHC 172 (Pat)