Next To Cellulosic Patents (Class 428/490)
Paper (Class 428/491)
  • Process for making pitch impregnated articles
    Patent number: 3953628
    Abstract: Disclosed is a pitch impregnant composition comprising coal tar pitch, oxidized, or unoxidized petroleum pitch with stearic acid, and particulated metallic pigments including copper, aluminum, steel, silver, iron, tin, nickel and zinc metals and copper-zinc alloys. The process comprises forcing the molten impregnant composition into the surface of the porous article preferably by imposing pressure on the impregnant composition while the article to be treated is immersed therein. Articles so treated exhibit a metallic surface appearance.
    Type: Grant
    Filed: August 22, 1973
    Date of Patent: April 27, 1976
    Assignee: Ashland Oil, Inc.
    Inventor: Charles R. Gannon