Ben Klemens writes via Ars Technica: A landmark 2014 ruling by the Supreme Court called into question the validity of many software patents. In the wake of that ruling, countless broad software patents became invalid, dealing a blow to litigation-happy patent trolls nationwide. But this week the US Patent and Trademark Office (USPTO) proposed new rules that would make it easier to patent software. If those rules take effect, it could take us back to the bad old days when it was easy to get broad software patents -- and to sue companies that accidentally infringe them.
The Federal Circuit Appeals Court is the nation's highest patent court below the Supreme Court, and it is notoriously patent friendly. Ever since the Supreme Court's 2014 ruling, known as Alice v. CLS Bank, the Federal Circuit has worked to blunt the ruling's impact. In a 2016 ruling called Enfish, the Federal Circuit ruling took a single sentence from the Supreme Court's 2014 ruling and used it as the legal foundation for approving more software patents. This legal theory, known as the "technical effects doctrine," holds that software that improves the functioning of a computer should be eligible for a patent. A version of this rule has long held sway in Europe, but it has only recently started to have an impact in U.S. law.
This week, the Patent Office published a new draft of the section on examining software and other potentially abstract ideas in its Manual of Patent Examination Procedure (MPEP). This is the official document that helps patent examiners understand and interpret relevant legal principles. The latest version, drawing on recent Federal Circuit rulings, includes far tighter restrictions on what may be excluded from patentability. This matters because there's significant evidence that the proliferation of software patents during the 1990s and 2000s had a detrimental impact on innovation -- precisely the opposite of how patents are supposed to work.
Read more of this story at Slashdot.