PL Graham v. John Deere (1966)

1955- Fifth Circuit Court declared patent valid

Reasoning: "A combination is patentable when it produces an 'old result in a cheaper and otherwise more advantageous way.'" Basically saying that although patent '798 is a combination of old features, it is an improvement which results in certain advantages which give it novelty, utility, and nonobviousness.

1964- Eighth Circuit Court declared patent invalid

(affirmed by Supreme Court- say neither Circuit Court applied "correct test")

- First time Supreme Court had to interpret and use Sec. 103, Nonobviousness

Patent 2,493,811 "Vibrating Plow and Mounting" (original plow patent): claims that the plow has been made more effective by providing a pronounced pumping or vibratory action of the tools. Plow is more effective by (1) moving the fine soil to the bottom and coarse soil to the top which improves moisture collection, (2) creating small pools which can collect water, and (3) making the plow easier to pull. The plow also protects the work tool.

Graham received patent '811 (above) in 1950 for plow with pumping action. He altered the design and received patent '798 in 1953. Patent '798 is under debate for infringement. Supreme Court declared INVALID.

Patent 2,627,798 "Clamp for Vibrating Shank Plows" (Graham's altered plow patent): one difference: part 29 which transfers some of the force on the shank to the upper section of the I-beam. another difference: part 28 provides additional support, parts 31 and 32 do the same. also, part 41 is used to provide further clamping on the I-beam from the top.