Patents by Inventor Stephen J. Schaefer

Stephen J. Schaefer 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).

  • Audio headset
    Patent number: D606972
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: December 29, 2009
    Assignee: SJS & Sons, Inc.
    Inventor: Stephen J. Schaefer
  • Audio headset
    Patent number: D611934
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: March 16, 2010
    Assignee: SJS & Sons, Inc.
    Inventor: Stephen J. Schaefer
  • Audio headset
    Patent number: D674377
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: January 15, 2013
    Assignee: SJS & Sons, Inc.
    Inventor: Stephen J. Schaefer