Patents by Inventor Akemi Muraoka

Akemi Muraoka 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 of recovering useful material through cracking of plastic material
    Patent number: 5895827
    Abstract: There is provided a process to recover phthalic anhydride from a plastic material which contains a phthalate ester as a plasticizer comprising the steps of:(a) heating the plastic material so that the plastic material is gasified to produce a first product,(b) contacting the first product with alumina catalyst so that the product is catalytically cracked to produce a first catalytically cracked product comprising phthalic anhydride; and(c) recovering phthalic anhydride from the first catalytically cracked product.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: April 20, 1999
    Assignee: Mazda Motor Corporation
    Inventors: Toshiki Takahashi, Tatsuto Fukushima, Yoshio Tanimoto, Akemi Muraoka
  • Process for recovering phthalic anhydride and hydrogen chloride from plastic materials
    Patent number: 5686055
    Abstract: There is provided a process to recover phthalic anhydride from a plastic material which contains a phthalate ester as a plasticizer comprising the steps of:(a) heating the plastic material so that the plastic material is gasified to produce a first product,(b) contacting the first product with alumina catalyst so that the product is catalytically cracked to produce a first catalytically cracked product comprising phthalic anhydride; and(c) recovering phthalic anhydride from the first catalytically cracked product.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: November 11, 1997
    Assignee: Mazda Motor Corporation
    Inventors: Toshiki Takahashi, Tatsuto Fukushima, Yoshio Tanimoto, Akemi Muraoka
  • Method of obtaining hydrocarbon oil from waste plastic material or waste rubber material and apparatus for carrying out the method
    Patent number: 5414169
    Abstract: A method of obtaining hydrocarbon oil from waste plastic material or waste rubber material, comprising the steps of: subjecting the waste plastic material or the waste rubber material to thermal cracking so as to obtain a thermal cracking product; liquefying the thermal cracking product into a liquefied product; causing a liquid phase cracking reaction of the liquefied product under action of a catalyst on the liquefied product so as to produce a cracking product; and cooling the cracking product so as to obtain the hydrocarbon oil, and an apparatus used for carrying out the method.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: May 9, 1995
    Assignee: Mazda Motor Corporation
    Inventors: Toshiki Takahashi, Yoshio Tanimoto, Akemi Muraoka, Tatsuto Fukushima