Letter to James Madison, August 28, 1789 http://www.founding.com/founders_library/pageID.2184/default...
Letter to James Madison, August 28, 1789 http://www.founding.com/founders_library/pageID.2184/default...
[0]http://press-pubs.uchicago.edu/founders/documents/a1_8_8s12.... Thomas Jefferson to Isaac McPherson 13 Aug. 1813 Writings 13:333--35
Jefferson was, of course, an inventor himself, though not as prolific of one as Benjamin Franklin, who also opposed patents.
"An act of Congress authorising the issuing patents for new discoveries has given a spring to invention beyond my conception. Being an instrument in granting the patents, I am acquainted with their discoveries. Many of them indeed are trifling, but there are some of great consequence which have been proved by practice, and others which if they stand the same proof will produce great effect." - Jefferson to Benjamin Vaughan, June 27 1790 [2]
[1] http://www.monticello.org/site/research-and-collections/pate...
[2] http://founders.archives.gov/documents/Jefferson/01-16-02-03...
> On-Topic: ... anything that gratifies one's intellectual curiosity.