Patents by Inventor John T. Dolby

John T. Dolby 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).

  • 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