Patents by Inventor Lawrence W. Mack

Lawrence W. Mack 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).

  • Butterfly valve
    Patent number: 4243203
    Abstract: A butterfly valve disk plate having a plurality of fluid directing ribs extending from the disc perpendicular to the plane of the disk, the ribs on one side of the disk being located opposite the spaces between the ribs on the other side of the disk and the ribs on one half of one side of the disk being staggered with respect to the ribs on the other half of the same side of the disk.
    Type: Grant
    Filed: July 20, 1979
    Date of Patent: January 6, 1981
    Inventor: Lawrence W. Mack