Patents by Inventor Kazumitsu Fujihara

Kazumitsu Fujihara 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).

  • Rubber process oil and production process thereof
    Patent number: 6878263
    Abstract: Disclosed is a rubber process oil in which the content of polycyclic aromatics (PCAs) as determined by the IP 346 method is less than 3% by mass and which is rich in aromatic hydrocarbons, and a method for producing the same. The aniline point of the rubber process oil is 80° C. or less, and the % CA value as determined by ring analysis according to the Kurtz method is from 20 to 50%. The rubber process oil is produced by using extraction of lube oil fraction with a solvent having a selective affinity for aromatics. The extraction conditions are determined so that the extraction yield is regulated to a predetermined requirement defined by the PCAs content of the lube oil fraction. Alternatively, the extract is cooled to further separate into the extract and the raffinate, and the second raffinate is used for the rubber process oil.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: April 12, 2005
    Assignee: Japan Energy Corporation
    Inventors: Takashi Kaimai, Kazumitsu Fujihara, Yoshiyuki Morishima
  • Rubber process oil and production process thereof
    Publication number: 20010023307
    Abstract: Disclosed is a rubber process oil in which the content of polycyclic aromatics (PCAs) as determined by the IP 346 method is less than 3% by mass and which is rich in aromatic hydrocarbons, and a method for producing the same. The aniline point of the rubber process oil is 80° C. or less, and the %CA value as determined by ring analysis according to the Kurtz method is from 20 to 50%. The rubber process oil is produced by using extraction of lube oil fraction with a solvent having a selective affinity for aromatics. The extraction conditions are determined so that the extraction yield is regulated to a predetermined requirement defined by the PCAs content of the lube oil fraction. Alternatively, the extract is cooled to further separate into the extract and the raffinate, and the second raffinate is used for the rubber process oil.
    Type: Application
    Filed: April 27, 2001
    Publication date: September 20, 2001
    Applicant: Japan Energy Corporation
    Inventors: Takashi Kaimai, Kazumitsu Fujihara, Yoshiyuki Morishima
  • Rubber process oil and production process thereof
    Patent number: 6248929
    Abstract: Disclosed is a rubber process oil in which the content of polycyclic aromatics (PCAs) as determined by the IP 346 method is less than 3% by mass and which is rich In aromatic hydrocarbons, and a method for producing the same. The aniline point of the rubber process oil is 80° C. or less, and the % CA value as determined by ring analysis according to the Kurtz method is from 20 to 50%. The rubber process oil is produced by using extraction of lube oil fraction with a solvent having a selective affinity for aromatics. The extraction conditions are determined so that the extraction yield is regulated to a predetermined requirement defined by the PCAs content of the lube oil fraction. Alternatively, the extract is cooled to further separate into the extract and the raffinate, and the second raffinate is used for the rubber process oil.
    Type: Grant
    Filed: January 21, 1999
    Date of Patent: June 19, 2001
    Assignee: Japan Energy Corporation
    Inventors: Takashi Kaimai, Kazumitsu Fujihara, Yoshiyuki Morishima