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.
1 1890: A St. Louis physician developed the idea of packaging peanut paste for people with bad teeth. 2  Peanut paste was sold for six cents per pound. 3  1895: The Kellogg brothers patented the process of preparing peanut butter with steamed nuts. 4  Today the nuts are roasted, and the peanut butter is much tastier.