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Over the years a number of patents for processing industrial hemp have been designed.  The earliest we've found was 1840 with a wide array of variations and designs since then. Given the state of the industry, one might conclude that the hemp sector has missed the industrial revolution.

This is a collection of some of the patents done since 1906: 1919  1941 1949 1956 up to 2006.  A few new patents have turned up.

HempPatent1906

HempPatent19191919 Schlichten Patent. This was one of the few decorticators to make it to commercial use. The inventor died four years later. Designs from Russian, Germany and Ireland came into the market. You can still find old Schlichten units in France and Russia from the 1960's.

 

HempPatent1941

HempPatent1949

HempPatent1956

HempPatent1956 2

 

 Hemp Patent 1956 PlanetaryDecorticatorPlanetary Design

HammerMill Hammer Mill Design

TCIpatent 1D-8 Decorticator Patent 2006