Patents by Inventor Douglas Keller Firedman

Douglas Keller Firedman 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).

  • Concrete block making machine and method
    Publication number: 20080174041
    Abstract: A method for manufacturing decorative concrete blocks for decorative garden walls is presented, along with a machine suitable for practicing the method.
    Type: Application
    Filed: January 23, 2007
    Publication date: July 24, 2008
    Inventors: Douglas Keller Firedman, Joseph Francis McLaughlin