COFFIN, Circuit Judge.
The principal question presented by these cross appeals is whether the district court erred in holding invalid as obvious an RCA patent — Greig patent 3,052,540 [hereinafter sometimes patent '540] — which specified 29 organic dyes which increase the sensitivity of the electrophotographic copying paper used in many office copying machines.
Harold Greig, a scientist employed by RCA, obtained the patent in 1962 on the basis...
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