Charles Newbold (1764–1835) was an American blacksmith born in Chesterfield, New Jersey.
On June 26, 1797, Newbold received the first patent for a cast-iron plow.
However, he was unable to sell his plow because many farmers feared that the iron in it would poison the soil.
[1] On April 1, 1807, inventor David Peacock was issued a patent for a three-piece iron plow (Newbold's plow was cast in one piece).
Newbold then sued Peacock for patent infringement and won $1500.