Patents by Inventor Hans D. Holtz, deceased

Hans D. Holtz, deceased 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).

  • Aminoamide fuel detergents
    Patent number: 4249912
    Abstract: A detergent additive aminoamide, prepared by reacting a polycarboxylic amino acid with alkylamines, is combined into fuel for an internal combustion engine or lubricating oil as a composition suitable for reducing deposits in an internal combustion engine. In an embodiment of the invention, the aminoamide is further combined with a sulfonic acid to obtain a fuel detergent of improved operability.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: February 10, 1981
    Assignee: Phillips Petroleum Company
    Inventors: Hans D. Holtz, deceased, Benedict R. Bonazza
  • Imidazoline fuel detergents
    Patent number: 4247300
    Abstract: A detergent additive imidazoline prepared by reacting carboxylic acid with polyamine is combined into fuel for an internal combustion engine or lubricating oil as a composition suitable for reducing deposits in an internal combustion engine. In an embodiment of the invention, the imidazoline is further combined with a sulfonic acid to obtain a fuel detergent of improved operability.
    Type: Grant
    Filed: April 27, 1978
    Date of Patent: January 27, 1981
    Assignee: Phillips Petroleum Company
    Inventors: Benedict R. Bonazza, Hans D. Holtz, deceased