Patents by Inventor Gerald A. MacAlpine

Gerald A. MacAlpine 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).

  • Lubricating oil having an average ring number of less than 1.5 per mole containing a succinic anhydride amine rust inhibitor
    Patent number: 5225094
    Abstract: The rust inhibition capability of a lubricating oil having an average ring number per mole of less than 1.5 can be enhanced by adding a rust inhibitor that is capable of reducing the oil/water interfacial tension to between about 1 to about 4 mN/m.
    Type: Grant
    Filed: December 18, 1991
    Date of Patent: July 6, 1993
    Assignee: Exxon Research and Engineering Company
    Inventors: Lilianna Z. Pillon, Andre E. Asselin, Gerald A. MacAlpine
  • Wax isomerate having a reduced pour point
    Patent number: 5149452
    Abstract: A combination of a low and a high molecular weight polyalkylmethacrylate has been found to be effective in reducing the pour point of a wax isomerate to a level that cannot be obtained with conventional pour point depressants. In a preferred embodiment, the wax isomerate is a slack wax isomerate.
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: September 22, 1992
    Assignee: Exxon Research and Engineering Company
    Inventors: Gerald A. MacAlpine, Partick M. E. Halls, Andre E. Asselin
  • Selected heteroaromatic nitrogen compounds as antioxidant/metal deactivators/electrical insulators in lubricating oils and petroleum liquid fuels
    Patent number: 4367152
    Abstract: A hydrocarbon composition such as a lubricating or specialty oil containing a selected heteroaromatic nitrogen compound as an antioxidant/metal deactivator/electrical insulator having the following general formula: ##STR1## wherein each X is C or N with at least one X being N; Y is C or N; R is H or CH.sub.2 NR"'.sub.2 where each R" is H or alkyl of 1 to 20 carbons; R' is H, SR"' OR "' or NR"'.sub.2 with each R"' being H or alkyl of 1 to 20 carbons.
    Type: Grant
    Filed: July 2, 1981
    Date of Patent: January 4, 1983
    Assignee: Exxon Research and Engineering Co.
    Inventors: Peter G. Wright, John M. MacDonald, Gerald A. MacAlpine