Patents by Inventor Hiromi Kamihgaraguchi

Hiromi Kamihgaraguchi 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).

  • Cylindrical composite paperboard cushion core and process for producing same
    Patent number: 5514429
    Abstract: A cylindrical composite paperboard cushion core for winding a sheet material therearound without forming undesirable stepwise marks thereon, comprises a cylindrical paperboard substrate and a cushion layer formed on the cylindrical paperboard substrate from an expanded paper sheet having a density of 0.1 to 0.4 g/cm.sup.3, the expanded paper sheet being formed by forming an unexpended paper sheet containing therein a plurality of expansible microcapsules each having a volatile liquid core contained in a thermoplastic resin shell and capable of starting an expansion at a temperature of 80.degree. C. to 200.degree. C., and heating the unexpanded paper sheet at the expansion-starting temperature of the microcapsules or higher, to cause the paper sheet to be expanded.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: May 7, 1996
    Assignee: New Oji Paper Co., Ltd.
    Inventors: Hiromi Kamihgaraguchi, Tsunehisa Shigetani