Patents by Inventor Sidney Cheng

Sidney Cheng 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).

  • Measuring device
    Patent number: 5577330
    Abstract: An electronic hand holdable measuring device for measuring dimension of an article by rolling the device across surface of the article includes a housing 10 and a roller sub-assembly 11. When the roller is worn it can be readily replaced together with an associated raster disc 23 forming part of the sub-assembly. An optical reader is permanently mounted inside the housing.
    Type: Grant
    Filed: May 5, 1995
    Date of Patent: November 26, 1996
    Assignee: Advanced Technologies Limited
    Inventor: Sidney Cheng