Patents by Inventor Henk van Duursen

Henk van Duursen 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).

  • Method of checking and combining separate documents or part documents of the letter and envelope type
    Patent number: 5033725
    Abstract: A method for checking and combining separate documents having sections of text imprinted thereon for ensuring that documents taken from two or more groups possess the same identical sections of text includes the steps of conveying the documents taken from the groups of documents along a conveyor to a scanning position in front of an opto-electrical scanning device and scanning the documents with the opto-electrical scanning device in order to produce a series of digital signals. The digital signals associated with documents from two different groups of documents are then compared in a comparator to determine if the signals are identical.
    Type: Grant
    Filed: September 8, 1989
    Date of Patent: July 23, 1991
    Assignee: Svecia Antiqua Limited
    Inventor: Henk van Duursen