Patents by Inventor Gerald A. Tonges

Gerald A. Tonges 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).

  • Non-copying printed document and method of printing same
    Patent number: 4175774
    Abstract: A document with a background printed thereon which includes a first portion formed of small dots and a second portion formed of larger dots. The larger dots are of a size which is reproduced by a copying machine. The small dots are of a size which is not reproduced by the copying machine. When a copy is made, only the larger dots reproduce so that the copy is readily distinguishable from the original.
    Type: Grant
    Filed: March 23, 1978
    Date of Patent: November 27, 1979
    Assignee: American Standard Inc.
    Inventors: Gerald A. Tonges, Eugene L. Elmlinger