Patents by Inventor Barry D. Greig

Barry D. Greig 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).

  • Lubrication and a method of retrofilling a working fluid/lubricant composition
    Patent number: 5229025
    Abstract: The use of mixtures of 1,1,1,2-tetrafluoroethane and an ester having a molecular weight of greater than 250 as retrofill working fluid/lubricant combinations for mechanical vapor recompression heat transfer devices. Despite the presence of residual lubricant, e.g. hydrocarbon lubricants, from working fluid/lubricant combinations in which working fluids such as R12, R22, R502 or R511 are used, anticipated problems resulting from immiscibility such as excessive wear have not been observed.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: July 20, 1993
    Assignee: Castrol Limited
    Inventors: Brian H. Carter, Barry D. Greig