Current compressed air dryer types include the following products: 1  Refrigerant type: Cycling. 2  Regenerative desiccant type: Heatless (no internal or external heaters) Heated (internal or external heaters) Heat of Compression. 3  Single Tower Deliquescent. 4  Membrane.
History. Canadian Marcellus Gilmore Edson (February 7, 1849 â March 6, 1940) of Montreal, Quebec was the first to patent peanut butter, in 1884. Peanut flour already existed. His cooled product had a consistency like that of butter, lard, or ointment according to his patent application.
In 1922, chemist Joseph Rosefield invented a process for making smooth peanut butter that kept the oil from separating by using partially hydrogenated oil. In 1928 he licensed his invention to the company that created Peter Pan peanut butter. And in 1932 he began producing his own peanut butter under the name Skippy. 1  Peanuts are actually not nuts but legumes grown underground.