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.
But many people have been credited with the title of peanut-butter-inventor, among them George Washington Carver. However, he did not invent peanut butter; instead he promoted more than 300 uses for peanuts, among other crops such as soy beans and sweet potatoes. The actual invention of peanut butter, its process of manufacture and the machinery used to make it, can be credited to at least three doctors/inventors.