Patents by Inventor David M. Horbachewski

David M. Horbachewski 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).

  • Patent number: 4664774
    Abstract: A novel coal tar based, low solids content, pitch is produced by oxidizing a selected coal tar distillation fraction with air to oxygen at elevated temperatures. This pitch is applicable to end use in which low solids content is desirable. Specifically it may be advantageously applied to the impregnation of carbon electrodes. The oxidized selected coal tar based low solids material described is characterized by high carbon yield and higher product density and has a higher in situ coking value and lower sulfur content which make it particularly beneficial when it is used as an impregnating pitch as compared to the currently commercially used petroleum based pitch.
    Type: Grant
    Filed: February 20, 1985
    Date of Patent: May 12, 1987
    Assignee: Allied Corporation
    Inventors: Arthur S. Chu, Edward F. Bart, George R. Cook, David M. Horbachewski