Gretener, A. G. v. Dyson-Kissner Corp.

OPINION

EDELSTEIN, District Judge.

This action was commenced on November 21, 1966, by plaintiff Gretener, A.G., a Swiss company, filing a declaratory judgment action against defendant Dyson-Kissner Corporation seeking a declaration of non-infringement and invalidity of six patents owned by Dyson-Kissner. On March 29,1967, a summons and complaint in intervention was served upon defendant by plaintiffs-interveners, Maschinenfabrik Rieter, A.G., a Swiss company, and American Rieter Company, Inc., seeking a declaration of non-infringement of the same six United States patents for which Gretener was…