Trademarks Information. The following are the trademarks of Thebe Thebe Associates( TTA) : . Super Grade Humateâ „ ¢ ( SG-Humateâ „ ¢ ) ; . High Grade Humateâ „ ¢ ( HG-Humateâ „ ¢ ) ; . Mixed Grade Humateâ „ ¢ ( MG....