American Bricks patent
American Bricks were invented by a Swedish engineer, Nils I. Paulson, who filed for patent June 1939, granted Nov 1941 (Patent number 2262199). The bricks were originally made of pressed wood, and manufactured by the Halsam Products Company of Chicago. (Thanks to my friend David for extracting this patent diagram.)
Here is the technical description of the full brick from the patent application:
"The full size member is provided on one face with a plurality of dowels, there being two parallel rows of such dowels with four dowels in each row. ... In its opposite face the full size member is provided with the same number of sockets as dowels, the respective sockets being in register with the dowels."
American Bricks patent
American Bricks were invented by a Swedish engineer, Nils I. Paulson, who filed for patent June 1939, granted Nov 1941 (Patent number 2262199). The bricks were originally made of pressed wood, and manufactured by the Halsam Products Company of Chicago. (Thanks to my friend David for extracting this patent diagram.)
Here is the technical description of the full brick from the patent application:
"The full size member is provided on one face with a plurality of dowels, there being two parallel rows of such dowels with four dowels in each row. ... In its opposite face the full size member is provided with the same number of sockets as dowels, the respective sockets being in register with the dowels."