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Mandamus petitions pile up as challenges to revamped US PTAB continue

By Melissa Ritti ( September 19, 2025, 16:38 GMT | Insight) -- Sandisk on Thursday said reliance on patent age to turn away challenges to validity is “lawless on every level.” The company's mandamus petition is the fifth in recent months to take issue with what Sandisk characterized as a “dizzying reconstruction” of US Patent and Trademark Office authority to discretionarily deny inter partes review.The US Court of Appeals for the Federal Circuit on Thursday fielded its fifth petition since June for mandamus review of changes instituted by interim leadership at the US Patent and Trademark Office to the process for securing a second look at issued US patents....

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