Patents by Inventor Howard W. Gregory

Howard W. Gregory 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).

  • Patent number: 4078494
    Abstract: A letter press printing plate is disclosed for wrapping around a drum. The printing surface is formed with a light-sensitive material layer on a metal backing plate with two different levels, the high level representing areas of solid or dark tones of printing and the low level representing areas of light tones of printing. The printing plate overcomes the problem of even transfer of ink from the solid or dark tones of printing areas and the light tones of printing areas. A method of forming the letter press printing plate is also disclosed wherein a photo polymer layer on a backing plate is first exposed to a negative representing areas of solid or dark tones and light tones of printing. The photo polymer layer is then dissolved away to the backing plate in areas where no printing occurs and formed into a two-level printing surface with the areas of solid or dark tones being at a high level and the areas of light tones being at a low level.
    Type: Grant
    Filed: February 4, 1976
    Date of Patent: March 14, 1978
    Assignee: STANMont, Inc.
    Inventor: Howard W. Gregory