3,934,594Wheat, soy, corn silk, mesquite chips.
3,993,082Carbon Filled Paper.
6,289,897Sunflower, Soy, Cotton, Shea, Avocado, Rapeseed, Linseed, Tung, Castor Oil.
To see the patents, and what firms filed them:
(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).