Patents by Inventor Michael N. Sandman

Michael N. Sandman 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).

  • Portion of ductwork
    Patent number: D521147
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: May 16, 2006
    Assignee: Langdon Incorporated
    Inventors: Michael N. Sandman, Joseph P. Sandman
  • Portion of ductwork
    Patent number: D529598
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: October 3, 2006
    Assignee: Langdon Incorporated
    Inventors: Michael N. Sandman, Joseph P. Sandman
  • Gasket
    Patent number: D534253
    Type: Grant
    Filed: March 24, 2005
    Date of Patent: December 26, 2006
    Assignee: Langdon Incorporated
    Inventors: Michael N. Sandman, Joseph P. Sandman