"useful arts" = technical inventions. You can't have clear idea of what what the constitution means without knowing what was the terminology and context when

"useful arts" = technical inventions. You can't have clear idea of what what the constitution means without knowing what was the terminology and context when it was written. George Washington and James Madison wrote and promoted patent system extensively outside what is written in the constitution. Examples: Madison Federalist No. 43 etc. President Washington called on Congress to create a patent system in the first the State of the Union address ever. It resulted the Patent Act of 1790.