ALLEN SHARP, Chief Judge.
This is an appeal from a judgment of the United States District Court for the Eastern District of Pennsylvania (Green, J.) holding that U.S. Patent No. Re. No. 28,636 was unenforceable and invalid. We vacate and remand.
I.
Background
In 1962, Dr. Emanuel Grunberg, a scientist employed by Hoffmann-La Roche, discovered that the combination of the chemical compounds sulfamethoxazole (SMX) and trimethoprim ...
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