Patents by Inventor Tsuneharu Akiyama

Tsuneharu Akiyama 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).

  • Method of producing pneumatic radial tires with a rubber sheet over overlapped carcass edge portions
    Patent number: 5437751
    Abstract: An uneven appearance at a sidewall face of a pneumatic radial tire is improved by arranging a particular rubber containing no reinforcing cords sheet onto an outer face of an overlap portion of a carcass material or between opposed edge portions of the carcass material to be overlapped.
    Type: Grant
    Filed: July 23, 1992
    Date of Patent: August 1, 1995
    Assignee: Bridgestone Corporation
    Inventors: Shinichi Hirano, Tsuneharu Akiyama
  • Adhesive for adhering a polyester fibrous material to rubber
    Patent number: 4596854
    Abstract: An adhesive for adhering fibrous materials, particularly polyester fibrous material to rubber is disclosed, which comprises polyhydric phenol-polysulfides, resorcin excess resorcin-formaldehyde condensates, and RFL solution composed of resorcin-formaldehyde condensate and rubber latex.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: June 24, 1986
    Assignee: Bridgestone Corp.
    Inventors: Toshihiro Yotsumoto, Tsuneharu Akiyama
  • Sulfenamides in vulcanizable rubber composition
    Patent number: 3984383
    Abstract: A vulcanizable rubber composition suitable for the production of rubber materials having improved scorching stability and heat aging resistance can be obtained by compounding raw material rubber with a sulfenamide compound having the following general formula ##EQU1## wherein X represents a residue selected from the group consisting of residues of hydrocarbon, alkyl ether and secondary alcohol having 2-20 carbon atoms, and residues represented by the general formulae ##EQU2## (wherein R' represents a residue of hydrocarbon or alkyl ether having 0-20 carbon atoms, and R" represents a hydrocarbon residue having 1-10 carbon atoms), and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are same or different and are selected from hydrocarbon residues having 2-10 carbon atoms, and hydrogen atom, or R.sub.1 is ringed with R.sub.2 and/or R.sub.3 is ringed with R.sub.4, through the nitrogen atom of the general formula (1), to form heterocyclic rings of 5-7 members.
    Type: Grant
    Filed: May 1, 1973
    Date of Patent: October 5, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Tsuneharu Akiyama, Sakae Inoue, Kinji Masuda, Suminobu Kurahashi
  • Method for improving adhesion of metallic material with vulcanizable rubber composition
    Patent number: 3976624
    Abstract: This invention relates to an improvement of the adhesion of a metallic material such as copper, copper alloys and other metals coated therewith with a vulcanizable rubber composition. It is realized by previously adding orthoboric acid or a metal borate to the rubber composition in order to proceed with metal-rubber bonding reaction and vulcanization reaction in good balance, and vulcanizing an assembly of the metallic material and the boric compound containing rubber composition closely contacted therewith.
    Type: Grant
    Filed: February 28, 1974
    Date of Patent: August 24, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Sakae Inouye, Suminobu Kurahashi, Norio Wada, Motokazu Kikuchi, Kinji Masuda, Tsuneharu Akiyama, Toshiyuki Osaki