ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,446,481, issued on Oct. 21, was assigned to Osmundson Mfg. Co. (Perry, Iowa).
"Agricultural drill/planter/coulter/disc blade with step plane notch edge" was invented by Douglas G. Bruce (West Des Moines, Iowa).
According to the abstract* released by the U.S. Patent & Trademark Office: "A ground engaging agricultural blade, coulter, or disc having a central opening adapted to be attached to an implement for rotation about a substantially horizontal axis of rotation; the coulter or disc have an outer periphery; and plurality of step plane notches disposed in the outer periphery. The blade can be used with a hub disposed around the central opening or a spacer spool on a shaft extending ...