Pub. L. 94-131, tit. IV, ch. 37, sec. 10

Sec. 10. The first paragraph of section 282 of title 35, United States Code, is amended to read as follows: “§282. Presumption of validity; defenses “A patent shall be presumed valid. Each claim of a patent (whether in independent, dependent, or multiple dependent form) shall be presumed valid independently of the Validity of other claims; dependent or multiple dependent claims shall be presumed valid even though dependent upon an invalid claim. The burden of establishing invalidity of a patent or any claim thereof shall rest on the party asserting such invalidity.”.