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Federal Act
on Patents for Inventions
(Patents Act, PatA)1

1Amended by No I of the FA of 3 Feb. 1995, in force since 1 Sept. 1995 (AS 1995 2879; BBl 1993 III 706).

Art. 20

1 Ac­cept­ance of a pri­or­ity claim in the pro­ced­ure for the grant of the pat­ent does not re­lieve the pro­pri­et­or of the pat­ent of the ob­lig­a­tion to prove the ex­ist­ence of such right in the case of leg­al pro­ceed­ings.

2 The fil­ing on the basis of which pri­or­ity is claimed is pre­sumed to be the first fil­ing (Art­icle 17 para. 1 and 1bis).63

63Amended by No I of the FA of 17 Dec. 1976, in force since 1. Jan. 1978 (AS 1977 1997; BBl 1976 II 1).