What is the legal reality of a patent according to the 1911 court case Herman v. Youngstown Car Mfg. Co.?
A patent grants only the right to exclude others from making, using, or selling an invention rather than granting the right to practice the invention itself. This distinction was established in the 1911 court case Herman v. Youngstown Car Mfg. Co. where the court clarified that a patent holder might still be unable to practice their own invention if it infringes upon a broader, earlier patent held by someone else.