Patents by Inventor Tsuneo Mamada

Tsuneo Mamada 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).

  • Injection mold having a switching valve
    Patent number: 7497679
    Abstract: The mold comprises a stationary mold half (31) and a movable mold half (32). An annular groove (33) surrounding a cavity (30a) formed by the stationary mold half (31) and the movable mold half (32) is formed in one of the stationary mold half (31) and the movable mold half (32), and a mold seal member (36) formed of a silicon rubber is disposed in the annular groove (33). A mold seal groove (37) opposed to the mold seal member (36) is formed in the other of the stationary mold half (31) and the movable mold half (32). The mold seal member (36) is projected from the contact surface of the stationary mold half (31) or the movable mold half (32) and comprises a fitting part (36a) fittedly installable in the mold seal groove (37). The cross sections of the fitting part (36a) and the mold seal groove (37) are formed in an approximately same shape.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: March 3, 2009
    Assignee: Mamada Sangyo
    Inventor: Tsuneo Mamada
  • Mold, Method Of Manufacturing The Same, Injection Molding Device, And Injection Molding Method
    Publication number: 20080031996
    Abstract: The mold comprises a stationary mold half (31) and a movable mold half (32). An annular groove (33) surrounding a cavity (30a) formed by the stationary mold half (31) and the movable mold half (32) is formed in one of the stationary mold half (31) and the movable mold half (32), and a mold seal member (36) formed of a silicon rubber is disposed in the annular groove (33). A mold seal groove (37) opposed to the mold seal member (36) is formed in the other of the stationary mold half (31) and the movable mold half (32). The mold seal member (36) is projected from the contact surface of the stationary mold half (31) or the movable mold half (32) and comprises a fitting part (36a) fittedly installable in the mold seal groove (37). The cross sections of the fitting part (36a) and the mold seal groove (37) are formed in an approximately same shape.
    Type: Application
    Filed: June 21, 2005
    Publication date: February 7, 2008
    Inventor: Tsuneo Mamada