Patents by Inventor Gary L. Siewell

Gary L. Siewell 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).

  • Ink jet printhead having hydraulically separated orifices
    Patent number: 4578687
    Abstract: An orifice plate for an ink jet printhead wherein a plurality of elongated isolator slots are adjacent the orifices and in fluid communication therewith, so as to prevent cross-talk between adjacent orifices.
    Type: Grant
    Filed: March 9, 1984
    Date of Patent: March 25, 1986
    Assignee: Hewlett Packard Company
    Inventors: Frank L. Cloutier, Paul H. McClelland, William R. Boucher, Gary L. Siewell