Homework 3 - ewolz
Conclusion of Obviousness
In reading patent 2493811, it is apparent that ample evidence exists to show that the changes made by Graham and proposed in 2627798 were obvious to a mechanic acquainted with the business and of ordinary ingenuity and skill. Both patents claim a "plow having a frame and a ground working device provided with a shank". The shanks for each plow are designed to make the ground working tool pump in order to work fine soil to the bottom to act as a seed bed and the course materials to the top for better mulch and moisture collection.