A product called “Petroleum Jelly” was patented by chemist Robert Chesbrough on May 14, 1878. The scientist drew attention to the amazing properties of an ointment consisting of a mixture of mineral oils and paraffin. Vaseline does not oxidize, is not saponified by alkali solutions, does not change under the influence of concentrated acids and does not go bitter in air, therefore it is used for impregnating paper and fabrics in the electrical industry.