United States Statutes at Large/Volume 6/13th Congress/3rd Session/Chapter 36
Chap. XXXVI.—An Act to extend the time of Oliver Evans’s patent for his improvement on steam engines.
Patent right extended for seven years.Be it enacted, &c., That all the rights and privileges of Oliver Evans, under a patent issued from the department of state, on the fourteenth day of February, one thousand eight hundred and four, for his improvements on steam engines, be, and hereby are, extended to the said Oliver Evans, his heirs, administrators or assigns, for and during the term of seven years, to commence from, and immediately after, the expiration of the term of fourteen years, granted by said patent as aforesaid; subject to all the provisions of the act, entitledAct of Feb. 21, 1793, ch. 11. “An act to promote the progress of the useful arts, and to repeal the act heretofore made for that purpose,” excepting so far as regards the extension of the term of his said patent herein authorized: Provided, That it shall not be lawful for the said Oliver Evans, his heirs, administrators or assigns, to charge or receive from any person or persons a greater sum for the privilege of constructing or using his said improvements on steam engines, during the term for which his said patent is hereby extended, than he has hitherto charged and received for a like privilege under his said patent as now in force.
Approved, February 7, 1815.