Patent by Mark Sunderland #1

High temperature bio-char carbonization and micron grinding and classification for inclusion into master batch polymerization

A thermal process for carbonizing hemp and reducing particle size, mechanically, by grinding or milling said carbonized hemp materials to generate a precise particle size hemp char and combining the hemp char particles with a polymer into a master batch.

Filed: Apr 26, 2019
Publication Date: Oct 31, 2019

This patent focuses on particulate generation and size. Interesting takeouts from the drawings include:

>10 microns = Composites
5-10 microns = Industrial fibres / fabric uses
2-5 microns = Home furnishings
<2 microns = Apparel fibres / fabric uses

https://patents.justia.com/patent/20190330532
http://www.freepatentsonline.com/20190330532.pdf (drawings included here)