The United States patent law is a first-to-invent patent legal framework. By contrast, all other national patent laws are first-to-file systems. Only the Philippines has also had a first-to-invent patent system, but converted it into a first-to-file system in 1998. The provisions of the law are laid out in title 35 of the United States Code (U.S.C.).
In the U.S., a patent is a right to exclude others from making, using, selling, offering for sale, exporting, exporting components to be assembled into an infringing device outside the U.S., importing the product of a patented process practiced outside the U.S., inducing others to infringe, offering a product specially adapted for practice of the patent, and a few other very carefully defined categories. Thus, merely thinking about an invention, or drawing a diagram, is not an infringement. Research for "purely philosophical" inquiry is not an infringement, but research directed to commerical purposes is - unless the research is directed toward obtaining approval of the Food and Drug Administration for introduction of a generic version of a patented drug.
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