Almost two dozen law professors have urged the Federal Circuit to reconsider a ruling that found the company that owns the Sharper Image brand was barred by a license agreement from challenging three virtual reality patents at the Patent Trial and Appeal Board.

Twenty-one professors, from schools including Stanford, Rutgers and Santa Clara, joined an amicus brief filed Monday supporting MerchSource LLC’s bid for a rehearing of the April ruling, which requires the company to attempt to dismiss its requests for America Invents Act reviews.

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The law professors are represented by Phillip Malone, director of the Juelsgaard Intellectual Property and Innovation Clinic of the Mills Legal Clinic at Stanford Law School.