As the final pieces of the America Invents Act are about to go into effect March 16, intellectual property lawyers are scrambling to get thousands of last-minute patent filings in before the old rules expire Friday.

And with firms inundated by clients’ interest in updating their patent filings before the country moves from a first-to-invent to a first-to-file patent system Saturday, those lawyers expressed concern that the servers at the U.S. Patent and Trademark Office may not be able to handle the surge in online filings.