Patents by Inventor Calvin Schiefferly

Calvin Schiefferly 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).

  • Mobile work zone protection device
    Publication number: 20050141960
    Abstract: A mobile work zone protection device is disclosed. It includes a front carrier, a barrier beam assembly, and a rear carrier. In one embodiment, the barrier beam assembly includes two sets of telescoping beam structures. Each of these structures can rotate from one side of the device to the other, and thus can be deployed to create a safe work zone for roadway workers on either side of the device. The structure can also be left in the transit position to provide and enclosed safe work zone.
    Type: Application
    Filed: April 6, 2004
    Publication date: June 30, 2005
    Inventors: Calvin Schiefferly, Angela Wheeler, Jeremy Matsuo