BULLARD MASK PATENTS

Two patents were filed by Edward Bullard specifically depicting the Bullard masks's facepiece, both are shown here. Two exhale valves were also patented, and those are shown below.

April 7, 1932 Patent
April 7, 1932 Patent
April 7, 1932 Patent
April 7, 1932 Patent
April 7, 1932 Patent
May 7, 1940 Patent
May 7, 1940 Patent
May 7, 1940 Patent

It is believed that the second patent shown here (May 7th, 1940) describes the later Bullard masks, as the exhale valve depicted closer resembles the plastic covers found on later models.

April 21, 1936 Patent
April 21, 1936 Patent
April 21, 1936 Patent

The exhale valve shown above describes the later plastic exhale valve system.

August 31, 1936 Patent
August 31, 1936 Patent
August 31, 1936 Patent

It is unknown which masks, if any, use the valve/cover combo shown above.

gasmaskbunker.com (c) Moulage, 2017. Drawings (c) Canis-Infernalis.

April 7, 1932 Patent