Way back in 1989 Canadian patent law changed from a first-to-invent system to a first-to-file system. Now the United States, a last hold-out along with the Philippines, will soon switch in the same way, pursuant to §3 of the America Invents Act, which will come into effect in March of next year.
A recent article in the New York Times (Steve Lohr, "In Canada, the Impact of America’s New Patent Law Is Seen") points us to an article by two University of Pennsylvania professors (economics, law) that uses the Canadian experience in the years before and after . . . [more]