Tom C. Clark,
United States v. Singer Manufacturing Company…
“ D. While Singer was negotiating the cross-license agreement with Vigorelli it learned that Gegauf, a Swiss corporation, had a patent covering a multiple cam mechanism. This placed an additional cloud over Singer's Harris reissue plan because the Gegauf patent enjoyed an effective priority date in Italy of May 31, 1952. This was nine days earlier than Singer's Harris patent filing date in the United States. In December 1955 Singer learned that Gegauf and Vigorelli had entered a cross-licensing agreement covering their multiple cam patents similar to the Vigorelli-Singer agreement. ”
