Edison Electric Light Co. v. Davis Electrical Works
U.S. Circuit Court for the District of Massachusetts
In Equity. Bill by tbe Edison Electric Light Company and others against tbe Davis Electrical Works for infringement of letters patent No. 223,898, granted January 27, 1880, to Thomas A. Edison for an electric lamp. Decree for complainants.
1Opinion of the Court
COLT, Circuit Judge.
If tbe Edison lamp were so constructed that a new burner could be placed in it, like a new wick in an ordinary lamp, or if it were made of two parts designed to be taken apart for the purpose of replacing the old burner with a new one, as in tbe Sawyer-Man lamp, I should bold that a purchaser of tbe Edison lamp bad a right to renew tbe carbon filament, on tbe ground that tbis was an ordinary repair, contemplated by tbe pat-entee when tbe lamp was sold, and that tbe defendant in so repairing such lamps did not infringe tbe Edison patent. B.ut the difficulty which meets me…
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