Patent model
On July 31, 1790 inventor Samuel Hopkins of Pittsford, Vermont became the first person to be issued a patent in the United States. His patented invention was an improvement in the "making of Pot Ash by a new apparatus & process." These earliest patent law required that a working model of each invention be produced in miniature.
Herbert A. Winkelmann
Winkelmann's first patent, with co-inventor Harold Gray, was obtained in 1921 during his employment with B. F. Goodrich. He was later employed by Philadelphia Rubber Works, Marbon Corp. and by Dryden Rubber Company.