Patents by Inventor Sadashige Okada

Sadashige Okada 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).

  • Modified asphalt-epoxy resin composition
    Patent number: 4499215
    Abstract: An asphalt/epoxy resin coating composition in which asphalt and epoxy resin are sufficiently compatible with each other is produced by mixing under heat asphalt with a condensation product of an asphalt and a non-thermoreactive phenol resin such as C.sub.4 -C.sub.8 alkylphenol-formaldehyde resin, the condensation being effected at a temperature of 160.degree. to 200.degree. C. in the presence of an arylsulfonic acid as catalyst.The coating composition gives an excellent coating without separation of asphalt or silking based on the incompatibility of asphalt and epoxy resin, by mixing with a curing agent for epoxy resin.
    Type: Grant
    Filed: July 28, 1983
    Date of Patent: February 12, 1985
    Inventor: Sadashige Okada