A Dayton, OH screen printer who developed in 1929 a knife-cut stencil film tissue named Profilm. An associate, A. S. Danemon patented the process that same year.

Profilm Corporation V. Blumenstock, (S.D.N.Y. 1940)

In 1940, ProFilm Corporation filed a patent infringement suit against Hyman Blumenstock (Morris Blumenstock and Henry Blumenstock, co-partners) who were doing business under the name of Silk Screen Stencil Paper. On final hearing on nonjury civil calendar for infringement by defendant (Blumenstock) of claims Nos. 1, 2, and 3 of United States Patent No. 1,781,834, granted November 18, 1930 to Louis F. D’Autremont for a stencil sheet on an application filed May 6, 1929, under Serial No. 360,754. District Judge Woolsey ruled for the plaintiff (Louis F. D’Autremont) in that the Patent No. 1,781,834 was valid and was infringed upon by the defendant (Blumenstock).