SAN JOSE — Lawyers for Google are urging U.S. District Judge Lucy Koh to allow the company to appeal legal questions at the center of email privacy suits that are closing in on the company.

In a controversial ruling last month, Koh struck down Google’s defenses to claims that it violated the federal Electronic Communications Privacy Act and state privacy laws by scanning Gmail messages to help sell ads. At a hearing on Tuesday, Google lawyer Kathleen Sullivan of Quinn Emanuel Urquhart & Sullivan pressed Koh to certify her order for interlocutory review, arguing that the judge had tackled novel legal questions which could reshape technology companies’ interactions with users.