Patents by Inventor Suminobu Kurahashi

Suminobu Kurahashi 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).

  • Patent number: 4028287
    Abstract: Method for the preparation of a foam polyamide in which the lactam together with a basic catalyst at a temperature above the melting point of the lactam is mixed with the promoter and foaming agent in a mixing vessel at ambient temperature while subjecting the mix to violent agitation to initiate polymerization, and the mix is discharged into a container for completion of the reaction before polymerization is more than 10% complete.
    Type: Grant
    Filed: June 4, 1975
    Date of Patent: June 7, 1977
    Assignee: Bridgestone Tire Company Limited
    Inventors: Shigetake Sato, Suminobu Kurahashi, Toru Okuyama, Noboru Hamada
  • Patent number: 4022719
    Abstract: Methods of preparing polyamide foam comprising polymerizing and foaming a mixture of one or more specified lactams, a basic alkali metal lactam catalyst, an alkyl isocyanate activator and a foaming agent at a temperature above the melting point of the lactam, and below the melting point of the polyamide foam thus produced.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: May 10, 1977
    Assignee: Bridgestone Tire Company Limited
    Inventors: Toru Okuyama, Susumu Muta, Suminobu Kurahashi, Shigetake Sato
  • 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
  • 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