While the language does not rise to the level of a presumption of invalidity,- it does incorrectly suggest that the jury must affirmatively find the patent valid, which is never appropriate. See Envirotech Corp. v. Al George, Inc., 730 F.2d 753, 762, 221 USPQ 473, 480 (Fed.Cir.1984) (“court never ‘declares’ a patent valid”).
Further, this court has disapproved of a challenger’s characterization of a patentee by the term “monopolist”, which is commonly regarded as pejorative. Union Carbide Corp. v. American Can Co., 724 F.2d 1567, 1574, 220 USPQ 584, 590 n. 4 (Fed.Cir.1984); Schenck v. Nortron Corp., 713 F.2d 782, 784, 218 USPQ 698, 699 (Fed. Cir.1983). In both of the cited cases, a bench trial was involved. Here, not only was Litton’s counsel not admonished for so characterizing Jamesbury before the jury, a more serious impropriety than in a bench trial, but also the characterization found its way into the instructions. As stated in Connell v. Sears, Roebuck & Co., 722 F.2d 1542, 1548, 220 USPQ 193, 198 (Fed.Cir.1983), the characterization of a patent as a “monopoly” is misdirected:
The phrase “patent monopoly” appears at various points. Under the statute, 35 U.S.C. § 261, a patent is a form of property right, and the right to exclude recognized in a patent is but the essence of the concept of property. Schenck v. Nortron Corp., 713 F.2d 782, 218 USPQ 693 (Fed.Cir.1983).
Instructions which supplement the statutory body of law governing patent validity by interjecting language to the effect that the public must be “protected” against a “monopoly,” a term found nowhere in the statute, are likely to be prejudicial and should be avoided.
B.
This court has repeatedly held that the facts leading to a conclusion of invalidity must be established by clear and convincing evidence. See, e.g., American Hoist & Derrick Co. v. Sowa & Sons, Inc., 725 F.2d 1350, 1360, 220 USPQ 763, 771 (Fed.Cir.1984) and its progeny. This standard is unvarying. Therefore, Jamesbury correctly asserts that error was committed by the district court in giving the following instruction to the jury:
If you find that to be so by a preponderance of the evidence, that the Saunders British patent or other prior art disclosed substantially the same things as set forth in Freeman’s claims 7 and 8 and in the same scope as here asserted for infringement purposes, then such claims 7 and 8 are void for lack of novelty. [Emphasis added.]
Litton responds that elsewhere in the instructions, the jury was instructed on the “clear and convincing” standard of proof.
The record shows that the jury was charged at the close of one day’s proceedings. Prior to beginning its deliberations the next day, after discussions with counsel, the court reinstructed the jury that the defendant had the burden of proving by clear and convincing evidence that the Patent and Trademark Office (PTO) was wrong in issuing the patent. The court then went on to instruct that where certain prior art was not considered by the PTO, or if the PTO was misled with respect to what a reference meant, then the burden was merely a preponderance of the evidence. Further, the court advised that, if the pat-entee were guilty of fraud (despite the absence of a fraud defense in this case), the plaintiff would have to prove that its patent was valid.4 Finally, the court summed up as follows:
There’s a presumption it [patent] was valid. Can be overcome by clear and convincing proof if certain prior art was not considered. It can be overcome merely by a preponderance of the evi
4
In connection with the inequitable conduct defense, we observe that even though expressly withdrawn, the operation of that defense was described to the jury. Under these circumstances, reference in the instructions to a patent owner misleading the examiner was prejudicial. Further, expanding the jury’s general knowledge of legal matters not material to the trial does nothing to enhance the jury’s comprehension or the proper administration of justice.