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.
Since then, peanut butter has been âinventedâ numerous times by various individuals throughout history. Although Carver didnât invent peanut butter, he did play a significant role in popularizing it and his 1880 âinventionâ of peanut butter preceded most of the other modern âinventorsâ of peanut butter.