Legal Opinion
Williamson v. Electric Service Supplies Co.
District Court, E.D. Pennsylvania
Decided October 9, 1916No. 1171PublishedCited by 1 opinion
In Equity. Bill by James E. Williamson against the Electric Service Supplies Company.
1Opinion of the Court
THOMPSON, District Judge.
The bill charges infringement of the Ramsey patent, No. 575,733, issued January 26, 1897, upon an application filed August 9, 1894. The patent contains a single claim, to wit:
“In a signal system for railways, a trolley or feed wire having a branch at each station, a line wire having a signal and a terminal switch at each station, and a return circuit; the switches co-operating with the return and branch circuits alternately, substantially as and lor the purpose specified.”
The answer, denies the validity of the patent because the device was described in a printed…
2Cases cited3 opinions
- Smith & Griggs Manufacturing Co. v. SpragueSupreme Court of the United States · 1887
- Hanifen v. E. H. Godshalk Co.Court of Appeals for the Third Circuit · 1898
- Bell v. MacKinnonCourt of Appeals for the Second Circuit · 1906
3Cited by1 opinion
- Williamson v. Electric Service Supplies Co.Court of Appeals for the Third Circuit · 1917