Patents by Inventor Daniel R. Cronkhite

Daniel R. Cronkhite 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).

  • Vibrator for screed boards
    Patent number: 4359296
    Abstract: An improved, portable, lightweight vibrator which is an integral unit and is easily and quickly removably secured to a screed board to vibrate it. Only a source of electrical power is required to operate it. Virtually any 2.times.4, 2.times.6 or larger boards of wood or metal such as aluminum or magnesium up to 20 feet in length can be used as the screed board. When properly installed on the screed board, the vibrator will walk or pull the screed board toward the rough pour, to save time and labor in leveling concrete.
    Type: Grant
    Filed: February 6, 1981
    Date of Patent: November 16, 1982
    Inventor: Daniel R. Cronkhite