Legal Opinion
Johnson v. Duquesne Light Co.
District Court, W.D. Pennsylvania
Decided August 15, 1928No. 1206PublishedCited by 1 opinion
1Opinion of the Court
SCHOONMAKER, District Judge.
This is a patent suit involving the validity and infringement of Johnson patent, No. 1,366,-078, issued January 18,1921, on application filed March 16, 1918, Serial No. 222,947.
Claims 6 to 11 of the patent are in suit. These all undertake to cover a method of testing of strings of suspension insulators on live transmission lines for the purpose of ascertaining whether or not any of the insulator units is defective.
As applied to electric lines, an insulator is a barrier to prevent the flow of electric current. On telegraph lines and low voltage transmission lines,…
2Cases cited14 opinions
- Boyden Power-Brake Co. v. Westinghouse Westinghouse v. Boyden Power-Brake Co.Supreme Court of the United States · 1898
- O'Reilly v. MorseSupreme Court of the United States · 1854
- Westinghouse v. Boyden Power Brake Co.Supreme Court of the United States · 1898
- Corning v. BurdenSupreme Court of the United States · 1854
- Le Roy v. TathamSupreme Court of the United States · 1853
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3Cited by1 opinion
- General Chemical Co. v. Selden Co.District Court, W.D. Pennsylvania · 1932