Patents Examined by Ralph S. Kendale
  • Method for preventing the adherence of oil to surfaces
    Patent number: 4160063
    Abstract: A method for preventing the adherence of oil to sucker rods or other surfaces in oil wells, by coating the surfaces contacting the oil with a film of a polymer that prevents or reduces oil adherence. Among materials effective in reducing oil adherence is an oleophobic film formed by complexing carboxymethylcellulose with salts of polyvalent metals such as aluminum, chromium and iron.
    Type: Grant
    Filed: May 12, 1977
    Date of Patent: July 3, 1979
    Assignee: Shell Oil Company
    Inventor: Paul E. Titus