Wikipedia tells me the original Torx patent[1] was filed in the 1960s, so anything related should have long since expired. (There’s apparently also a “Torx Plus

Wikipedia tells me the original Torx patent[1] was filed in the 1960s, so anything related should have long since expired. (There’s apparently also a “Torx Plus” patented[2] in the early 1990s around the time the original patent was expiring, but I don’t believe anybody deliberately chooses that one. Expired in 2011.) [1] US 3,584,667, https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/3584667 https://image-ppubs.uspto.gov/dirsearch-public/print/downloa... [2] US 5,207,132, https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5207132 https://image-ppubs.uspto.gov/dirsearch-public/print/downloa...