Apple, Cisco, Intel, and Google have sued the U.S. Patent and Trademark Office over it’s recent rule that it can refuse to adjudicate patent claims while litigation about them is pending in court.

The rule, which was introduced by the USPTO in March and became final in May, deals with the agency’s obligations around inter partes review (IPR) — a sort of expert-court process for assessing whether patent claims are valid. USPTO says deferring to an ongoing court case is more efficient than setting up a parallel review internally.

Check It Out: Big Tech Sues Patent Office Over Legal-Related Rule

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