Pharmaceutical company GlaxoSmithKline and inventor Triantafyllos Tafas have each petitioned the U.S. Court of Appeals for the Federal Circuit for an en banc rehearing of a March 20 decision that upheld the U.S. Patent and Trademark Office’s authority to issue three of four controversial patent rules.

The 2-1 majority opinion in Tafas v. Doll upheld rules that require a more cumbersome process for requesting continuing patent applications and other rules that sharply restrict the number of patent claims on an application unless the applicant files so-called examination support documents, which are expensive to produce.

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