Patents by Inventor Daniel Roulin

Daniel Roulin 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).

  • Device for detecting a missing copy by detecting the presence or absence of a colored area on a surface
    Patent number: 4948982
    Abstract: An optical scanner scans the surface of printed material at a particular position of the surface to determine if the surface is properly marked. The output level of the scanner at that position is compared with the output level of a differential signal level generator. If the two levels are substantially the same, then no error is indicated. If the two levels are different, then an error is indicated and the process is stopped to correct the error.
    Type: Grant
    Filed: July 3, 1989
    Date of Patent: August 14, 1990
    Assignee: Somerville Packaging
    Inventor: Daniel Roulin