The United States Patent and Trademark Office (USPTO) has released an update to its study on multiple Patent Trial and Appeal Board (PTAB) petitions that it says demonstrates that serial and parallel petition practice at the PTAB has been decreasing since 2016, when the Office first issued guidance on the subject. Serial petitions are characterized as petitions filed to challenge the same patent more than 90 days after the initial petition, while parallel petitions are those filed 90 days or fewer apart. The report determined the total number of challenges in each fiscal year by looking at how many times a particular petitioner challenged claims of a particular patent.

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