Patents by Inventor Yasuhiro Sagara

Yasuhiro Sagara 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).

  • Process and apparatus for preparing carbon black
    Patent number: 5254325
    Abstract: A process for preparing a carbon black which can control the particle size distribution and aggregate size distribution of the carbon black. This apparatus comprises a combustion chamber, a cylindrical throat more contracted than the combustion chamber, which is adapted for forming a plug flow of the hot gas, downstream of said throat, an expanding venturi portion downstream of said throat, and a carbon black reaction chamber; and a process comprising forming a plug flow of the hot gas in at least the cylindrical throat and the expanding venturi portion; and feeding a hydrocarbon material from hydrocarbon material spraying nozzles provided at two or more axially separate sites in the expanding venturi portion.
    Type: Grant
    Filed: April 20, 1992
    Date of Patent: October 19, 1993
    Assignee: Nippon Steel Chemical Co., Ltd.
    Inventors: Hiroshi Yamasaki, Yasuhiro Sagara, Kazuaki Shinohara, Hiroshi Nakagaki, Masaki Kurihara, Takaaki Kanai