Patents Assigned to BBDM, Inc.
  • Smoke mask apparatus
    Patent number: 4098270
    Abstract: A smoke mask comprises a transparent face shield covering a wearer's nose and eyes in a substantially airtight manner, and a replaceable air filtration cartridge system attached to the face shield and provided with a conduit leading into the mouth of the wearer, through which he breathes. Exhaled air passes through the air filter in a reverse direction from that inhaled and never comes into contact with the interior surface of the lens in the face shield, thus eliminating the possibility of fogging.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: July 4, 1978
    Assignee: BBDM, Inc.
    Inventor: John T. Dolby