Kurtis Dwight Davis
Member
Registered: August 2010
Location: Oklahoma countryside
Posts: 68
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Tue August 30, 2011 10:24am
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This illustration derives from the Griffin Patent, # 1480, dated 1869 and issued in London, England. Though Davis does not cite this particular art in '420, it was studied while composing patent language. This information is offered so as to further prove Davis' intent that a connecting rod could be used to accomplish invention described in Patent 4,458,420. Simple modification of Griffin's rod, as brought about by changing threads to female rather than male, does not amount to invention---no change(s) obvious to those skilled in the art can be claimed as invention.
In concept, it is much the same as Dickerman, which is in fact "cited".
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