In 1884 Mr. Clark was issued a patent for his invention from the United States Patent & Trademark Office (USPTO). There were 2 documents on file for this patent. The drawing specification sheet of the patent has been reproduced from original USPTO documents and printed onto parchment paper. This print is sized and ready to install into an 8" x 10" frame. The additional sheets included are printed on 5.50" x 8.50" parchment paper. These accompanying documents describe the scope of this invention in formal terms. The following is an actual excerpt from the patent…

       " Be it known that I, ALBERT JUDSON CLARK, a citizen of the United States, residing at Carbondale, in the county of Lackawanna and State of Pennsylvania, have invented a new and useful Coffee-Mill Motor, of which the following is a specification, reference being had to the accompanying drawings. This invention has relation to motors for increasing the speed of a grocer’s coffee-mill or spice-mill; and it consists in the construction and novel arrangement of parts, as will he hereinafter fully described, and particularly pointed out in the claims appended."…