Patents by Inventor Richard A. Skillman

Richard A. Skillman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Part-synthetic, aviation piston engine lubricant
    Patent number: 6191078
    Abstract: An aviation piston engine lubricant having no metal containing additive is provided. The lubricant contains (a) a base oil consisting essentially of a mixture of (i) at least about 50 wt % based on the total weight of the lubricant of one or more mineral oils having a viscosity in the range of about 5 cSt to about 25 cSt at 100° C. and (ii) about 15 to about 40 wt % based on the total weight of the lubricant of a polyalpha olefin fluid having a viscosity in the range of about 4 cSt to about 40 cSt at 100° C.; (b) at least about 3 wt % based on the total weight of the lubricant of an ashless polyisobutylene succinic anhydride/polyamine (PIBSA/PAM) dispersant; and (c) an effective amount of one or more ashless additives selected from the group consisting of antiwear agents, extreme pressure agents, metal passivators, and antioxidants.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: February 20, 2001
    Assignee: ExxonMobil Research and Engineering Company
    Inventors: Antika Shlomo, Frederick W. Girshick, Patrick Edward Godici, Richard A. Skillman
  • Anti-staining gear oils with low stray misting properties
    Patent number: 5639720
    Abstract: The stray misting property of anti-staining gear oil is reduced by adding to the gear oil from about 0.1 to 5 wt % polyisobutylene of about 37,000 to 140,000 Flory molecular weight.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: June 17, 1997
    Assignee: Exxon Research & Engineering Company
    Inventors: Shlomo Antika, Richard A. Skillman