1831—John Whitmee & Co., England, begin the manufacture of coffee-plantation machinery.
1831—The import duty on coffee in the United States is reduced to one cent a pound.
1832—A United States patent is granted to Edmund Parker and Herman M. White, Meriden, Conn., on a new household coffee and spice mill. (Chas. Parker Co. business founded same year.)
1832—Government coffee cultivation by forced labor is introduced into Java.
1832—Coffee is placed on the free list in the United States.
1832–33—United States patents are granted to Ammi Clark, Berlin, Conn., on improved coffee and spice mills for household use.
1833—Amos Ransom, Hartford, Conn., is granted a United States patent on a coffee roaster.
1833–34—A complete English coffee-roasting-and-grinding plant is installed in New York by James Wild.
1834—John Chester Lyman is granted a patent in England on a coffee huller employing circular wooden disks with wire teeth.
1835—Thomas Ditson, Boston, is granted a United States patent on a coffee huller. Ten others follow.