Patents by Inventor Hendrik Van Houwelingen

Hendrik Van Houwelingen 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).

  • Developing apparatus for high resolution photo-sensitive diazo plates
    Patent number: 4135803
    Abstract: An apparatus for developing high resolution photosensitive diazo plates by exposure to ammonia vapor is provided.
    Type: Grant
    Filed: March 29, 1977
    Date of Patent: January 23, 1979
    Assignee: GAF Corporation
    Inventor: Hendrik Van Houwelingen