Protex Signal Co. v. Feniger

It is unnecessary to discuss in detail the prior patent art. It is sufficient to say that a careful consideration of all of the prior patents relating particularly to “stop signals” introduced in evidence and the testimony in reference to a large number of others of the same character, not only compels the conclusion that none of them anticipate Kroehle, but also emphasizes the fact that many competitors were endeavoring, without success, to produce an automobile signal light that would operate as effectively in the daylight as in the night. The witness Bunyon, who as late as May 14, 1918,…