( August 27, 2026, 2:43 PM EDT) -- SAN JOSE, Calif. — A California federal judge held that a technology company was estopped from making doctrine of equivalents arguments in support of its infringement claims against Dropbox Inc., finding that the company surrendered all equivalents between the original version of its patent claims and an amended version when it added a claim limitation that required virtual files be “indistinguishable” from local files....