Interference No. 103,669 Burden of Proof The junior party's involved application was filed during the pendency of the senior party's patent application. Accordingly, for the junior party to prevail in a priority contest, the junior party must prove priority of invention by a preponderance of the evidence. See Peeler v. Miller, 535 F.2d 647, 651 n.5, 190 USPQ 117, 120 n.5 (CCPA 1976). Accord Bosies v. Benedict, 27 F.3d 539, 541-42, 30 USPQ2d 1862, 1864 (Fed. Cir. 1994). Cf. Price v. Symsek, 988 F.2d 1187, 1194, 26 USPQ 1031, 1036 (Fed. Cir. 1993). The senior party has not put on a case-in-chief. Therefore, the senior party’s date of invention is his actual filing date, December 5, 1994. Steitz’ Priority Case Conception has been defined as the formation, in the mind of the inventor, of a definite and permanent idea of the complete and operative invention. Coleman v. Dines, 754 F.2d 4Page: Previous 1 2 3 4 5 6 7 8 9 10 11 NextLast modified: November 3, 2007