Patents by Inventor Yasuharu Yoshii

Yasuharu Yoshii 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).

  • Carbon black for tire tread rubber
    Patent number: 5320820
    Abstract: There is disclosed carbon black for a tire tread rubber which has a nitrogen adsorption specific surface area (N.sub.2 SA) of 60 to 160 m.sup.2 /g and a dibutyl phthalate absorption (DBP) of 90 to 150 ml/100 g which belong to the respective regions of hard grades of carbon black, and an intraaggregate void volume Vp (ml/g) which is at most equal to the value calculated according to the formula.
    Type: Grant
    Filed: May 19, 1993
    Date of Patent: June 14, 1994
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Yasuharu Yoshii, Shinji Misono, Hitoshi Ue
  • Carbon black for tire tread rubber
    Patent number: 5198205
    Abstract: There is disclosed carbon black for a tire tread rubber which has a nitrogen adsorption specific surface area (N.sub.2 SA) of 60 to 160 m.sup.2 /g and a dibutyl phthalate absorption (DBP) of 90 to 150 ml/100 g which belong to the respective regions of hard grades of carbon black, and an intraaggregate void volume Vp (ml/g) at least equal to the value calculated according to the equation: [0.00976.times.DBP-0.0358].
    Type: Grant
    Filed: September 13, 1991
    Date of Patent: March 30, 1993
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Yasuharu Yoshii, Shinji Misono, Hitoshi Ue
  • Rubber composition
    Patent number: 5162421
    Abstract: A rubber composition comprising 100 parts by weight of a rubber component and compounded therewith 30 to 100 parts by weight of a carbon black of the category of hard carbon blacks having a nitrogen adsorption specific surface area (N.sub.2 SA) of 58 to 139 m.sup.2 /g, a DBP absorption number of 90 to 150 ml/100 g and having such selective characteristics that the intraaggregate void size, D.sub.p (nm), as measured by mercury porosimetry is equal to or higher than a value calculated by the relational formula [-0.22.times.(N.sub.2 SA)+60.8].
    Type: Grant
    Filed: April 15, 1991
    Date of Patent: November 10, 1992
    Assignee: Tokai Carbon Co., Ltd.
    Inventors: Hitoshi Ue, Yasuharu Yoshii, Shinji Misono