Patents by Inventor Helmar Putz

Helmar Putz 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).

  • Building board, particularly gypsum plasterboard
    Patent number: 4858402
    Abstract: In order to facilitate the placing of gypsum plasterboards, the boards are provided on their surface with a marking, which comprises length scales extending along regularly spaced apart lines which are parallel to the edges of the board. The marking may preferably be applied in the form of paints which fade under the action of light.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: August 22, 1989
    Inventor: Helmar Putz