Patents by Inventor Colin A. Langstone

Colin A. Langstone 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).

  • Methods of and apparatus for separating and detecting sheets
    Patent number: 5202554
    Abstract: The sheets within a stack of sheets are separated by clamping one end of the stack, bending the other end, clamping the other end and then unbending the stack. A radiation beam such as a laser beam is then directed at the stack of separated sheets, the beam reflecting from the edges of the sheets. The reflected signal is sensed by a photodetector which converts the received intensity into an electrical signal which is then fed to a processor, such as a microprocessor, to count the number of sheets.
    Type: Grant
    Filed: May 31, 1991
    Date of Patent: April 13, 1993
    Assignee: De La Rue Systems Limited
    Inventors: Christopher G. L. Wilton, Colin A. Langstone