Patents by Inventor .O slashed.ystein Ljungmann

.O slashed.ystein Ljungmann 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).

  • Breathing mask
    Patent number: 5687713
    Abstract: A breathing mask to be placed on a user's head includes a pressure gas container in the form of one or more closed communicating tubes which form a closed or a open ring adapted to encircle the user's face in front of the user's ears, a sealing member preferably being connected in serial arrangement with a pressure reduction valve and an airtight chamber of the mask.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: November 18, 1997
    Inventors: Erik W. Bahr, .O slashed.ystein Ljungmann, Nils Kvandal, Vigbj.o slashed.rn Matre