Patents by Inventor Keiichi Okumura

Keiichi Okumura 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).

  • Sheet take-up device for a projection screen and the like
    Patent number: 6529323
    Abstract: To provide a sheet take-up device for a projection screen and the like, said device being capable of simplifying the device in structure by omitting a one-way clutch and reducing components in number and capable of smoothly drawing out and taking up a sheet.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: March 4, 2003
    Inventor: Keiichi Okumura
  • Sheet take-up device for a projection screen and the like
    Publication number: 20020048083
    Abstract: To provide a sheet take-up device for a projection screen and the like, said device being capable of simplifying the device in structure by omitting a one-way clutch and reducing components in number and capable of smoothly drawing out and taking up a sheet.
    Type: Application
    Filed: September 6, 2001
    Publication date: April 25, 2002
    Inventor: Keiichi Okumura