Holding that "because extrinsic evidence can help educate the court regarding the field of the invention and can help the court determine what a person of ordinary skill in the art would understand claim terms to mean, it is permissible for the district court in its sound discretion to admit and use such evidence"
Holding that inventor testimony as to "[t]he subjective intent of the inventor when he used a particular term is of little or no probative weight in determining the scope of a claim (except as documented in the prosecution history)."
Holding that the district court abused its discretion in permitting a witness not qualified as an expert in the pertinent art to testify as an expert regarding issues of noninfringement or invalidity
Holding that "[w]here an accused infringer is clearly practicing only that which was in the prior art, and nothing more, and the patentee's proffered construction reads on the accused device, meeting burden of [establishing invalidity] should not prove difficult"
Holding that because the record established such a strong case of obviousness based on the teachings of the prior art, the fact that the product was successful does not overcome the conclusion of obviousness
Fed. R. Evid. 401 Cited 13,520 times 35 Legal Analyses
Providing that evidence is relevant if " it has any tendency to make a fact more or less probable than it would be without the evidence; and (b) the fact is of consequence in determining the action"
Fed. R. Evid. 402 Cited 6,721 times 11 Legal Analyses
Providing relevant evidence is admissible unless prohibited by the United States Constitution, a federal statute, the Federal Rules of Evidence, or other rules prescribed by the Supreme Court