Patents by Inventor William Crofutt

William Crofutt 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).

  • Dust bag positioning cylindrical member for a two-stage dust collecting machine
    Publication number: 20080016831
    Abstract: A dust bag positioning cylindrical member for a two-stage dust collecting machine is a cylindrical shape with an open upper end and an open lower end with a diameter a little less than that of a bag cylinder so that the dust bag positioning cylindrical member may be placed in and stabilize a dust bag previously placed in the bag cylinder. Thus the dust bag may not be blown to stick at the mouth of a first air exit during a second stage of dust collecting operation of the machine.
    Type: Application
    Filed: July 21, 2006
    Publication date: January 24, 2008
    Inventors: Chieh-Yuan Cheng, William Crofutt