Patents by Inventor Thomas R. Oswald

Thomas R. Oswald 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).

  • Water resistant security ink composition
    Patent number: 5720801
    Abstract: A leach resistant ink composition including a diphenyl guanidine compound, an acid, and a resin. The ink composition may further include a glycol and an alcohol and can be printed on paper, such as, for example, in the word "VOID". If bleach is used to attempt to alter the document, the initially colorless ink will form a colored image in the shapes or letters printed on the paper. The ink composition is resistant to leaching upon contact with, for example, water. The presence of the acid enables the security composition to be invisible by preventing or minimizing undesirable reactions with chemically sensitive paper.
    Type: Grant
    Filed: November 6, 1996
    Date of Patent: February 24, 1998
    Inventors: Wendy Nadan, John E. Kibbee, Thomas R. Oswald
  • Water resistant security ink composition
    Patent number: 5304587
    Abstract: A security composition for use with an ink composition including diphenyl guanidine and acrylic resin. The ink composition may further include a glycol ether and a plasticizer and can be printed on paper, for example in the word "VOID". If bleach is used to attempt to alter the document, the initially colorless ink will form a colored image in the shapes or letters printed on the paper. The ink composition is resistant to leaching upon contact with, for example, water.
    Type: Grant
    Filed: December 19, 1991
    Date of Patent: April 19, 1994
    Assignee: Moore Business Forms, Inc.
    Inventors: Thomas R. Oswald, James M. Raby