Sub-series 1. United States Patents, 1924-1946, undated

Arranged alphabetically by subject, this sub-series contains Ernst Berl’s United States patent files. These files concern individual patents awarded to Ernst Berl by the United States Patent Office. The files in this sub-series provide detailed primary documentation of the legal process through which Ernst Berl’s inventions were patented in the United States. They also contain technical information for the inventions represented in this series.

From the United States Patents files, one can learn much about the research and development work carried out by Berl to bring the represented inventions into being. They also provide extensive documentation of the legal work carried out by Ernst Berl’s younger son and patent attorney Herbert Berl, who frequently represented his father and played a major role in getting many of his father’s inventions patented.

The contents of the United States Patents files consist mainly of copies of patents, legal documents, and correspondence. Letters patents, drawing reproductions, drawings, clippings, and notes are preserved in these files as well.