RPC:HW due 2-4-11
Counseling for Graham's validity due to 103
In my opinion as one fluent in the stae of the art, Graham's clamp is a valid patent.
Counseling for Graham's invalidity due to 103
There are two main points of invalidity that I can see from the patents of Graham's clamp and the Glencoe Clamp. The first of which is that the Glencoe clamp is clearly employed in its entirety in for the fastening to the frame of the plow which is half of the invention's duty, as noted by number 38 in the figures. The other point of invalidity is that, as an expert in the art of mechanical engineering, I do not see any sort of ingenious leap to warrant a monopoly on this idea. For a simple problem that a plow gets snagged by an obstruction in the dirt, the logical next action is to lift the back blade to go over it in order to proceed, thus fabricating an articulating hinge which would necessarily require a spring to return to position would be obvious.