Patent Model - Building-Block

Maker and role
Carl Grünzweig (German), Patentee
Grünzweig & Hartmann (German), Assignee
Production date
Sep 20 1892
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Object detail

Cork, clay, tar
19 3/4 x 13 x 2 3/4" (50.2 x 33 x 7cm)
5 x 3 x 2" (12.7 x 7.6 x 5.1cm)
Grünzweig's patent is for a "method of manufacturing blocks, which consists in forming an aqueous solution of clay and tar to constitute a pulp, stirring the same to form a milky blue-white emulsion, adding cork chips, and molding and drying the product to cause evaporation of the volatile components of the tar..." (Patent Number 482,890)
Object number
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