Patents by Inventor Gregory L. Hiebert

Gregory L. Hiebert 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).

  • Pour point depressants and their use
    Patent number: 5707946
    Abstract: The pour point of paraffin-containing liquids is reduced by adding to the liquid an effective amount of a pour point depressant which is the reaction product of a hydrocarbyl-substituted phenol having a number average of greater than 30 carbon atoms in the hydrocarbyl-substituent, and an aldehyde of 1 to about 12 carbon atoms, or a source therefor. The pour point depressant is particularly useful for treating crude oils which have an initial pour point of 4.degree. C. or higher.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: January 13, 1998
    Assignee: The Lubrizol Corporation
    Inventors: Gregory L. Hiebert, Marvin B. DeTar
  • Deodorizing polysulfide materials
    Patent number: H1633
    Abstract: A deodorized polysulfide composition, comprising a major amount of polysulfide material and a minor but effective amount of a deodorizing composition comprising an oil-soluble tertiary alkanolamine of the formula: ##STR1## wherein R.sub.2, R.sub.3 and R.sub.4 are independently alkyl groups of about 1 to 6 carbon atoms; and a monohydric alkyl alcohol containing up to about 12 carbon atoms is disclosed.
    Type: Grant
    Filed: March 8, 1995
    Date of Patent: February 4, 1997
    Assignee: The Lubrizol Corporation
    Inventors: Gregory L. Hiebert, Karl F. Johnson