Thomson, S.Á. (“Thomson”) appeals from the June 24, 1997 order of the United States District Court for the District of Delaware in an action for patent infringement.
See Thomson, S.A. v. Quixote Corp.,
Background
Plaintiff-Appellant Thomson is the assign-ee of the patents in suit, which are directed to optical information-storage devices, such as compact discs (“CDs”). Thomson makes and markets machines that “read” or “play” CDs, and grants licenses under the patents in suit to companies which produce CDs. Defendants-Appellees, Quixote Corp. and Disc Manufacturing, Inc. (collectively, “Quixote”) make CDs. 1
Thomson sued Quixote for patent infringement. The parties agreed to base the outcome of the trial on three representative claims: claims 1 and 13 of U.S. Patent No. 4,868,808, and claim 1 of U.S. Patent No. 5,182,743. Before the full trial, the district *1174 court conducted a Markman hearing and issued a written opinion construing the representative claims.
At trial, the parties stipulated that Thomson’s invention date for the patents in suit is August 25, 1972. Quixote’s defense included evidence purporting to show that the representative claims are anticipated by an unpat-ented laser videodisc developed before August 1972 by a non-party, MCA Discovision, Inc. (“MCA”). After trial, the jury found in special verdicts that all of the representative claims were literally infringed, but that those claims are invalid due to lack of novelty (i.e., anticipated) under 35 U.S.C. § 102(g).
Thomson submitted a motion requesting that the district court either set aside the jury’s verdict of invalidity and enter Judgment as a Matter of Law (“JMOL”) holding the patents not invalid, or grant a new trial on the lack of novelty issue. Thomson argued that JMOL was proper because there was insufficient evidence in the record to support the jury’s anticipation verdict concerning certain claim limitations the court had held to be present following the Mark-man hearing.
In its opinion denying Thomson’s motion, the district court described evidence in the record supporting the jury’s finding of anticipation for each of the limitations that Thomson asserted had not been proven to be present in the MCA videodisc.
See Thomson 1,
Thomson appeals the district court’s denial of its motion for JMOL.
Analysis
JMOL is appropriate when “a party has been fully heard on an issue and there is no legally sufficient evidentiary basis for a reasonable jury to find for that party on that issue.”
Johns Hopkins Univ. v. Cellpro, Inc.,
Thomson’s first argument on appeal is that, in its memorandum opinion denying Thomson’s JMOL motion, the district court essentially ignored specific claim limitations that the court had identified following the Markman hearing. 2 This argument is particularly unpersuasive given the format of the district court’s opinion, in which the court began its analysis of each disputed limitation by reviewing the construction of the limitation it had made in the Markman hearing.
Thomson’s core argument in support of reversing the district court’s denial of its motion for JMOL is based on its assertions that (1) the jury verdict rests upon mere testimonial evidence by the two non-party MCA employees who worked on the videodisc project, and (2) this evidence is insufficient as a matter of law to support a holding of invalidity under subsection 102(g), because such testimonial evidence by inventors of their prior invention requires corroboration. Even if we accept Thomson’s first assertion, and further assume that the MCA employ *1175 ees were acting as inventors in the laser videodisc project, Thomson’s argument fails because this case does not present circumstances in which there is a need for corroboration, as hereinafter explained.
We begin with the language of 35 U.S.C. § 102(g);
A person shall be entitled to a patent unless—
(g) before the applicant’s invention thereof the invention was made in this country by another who had not abandoned, suppressed, or concealed it. In determining priority of invention there shall be considered not only the respective dates of conception and reduction to practice of the invention, but also the reasonable diligence of one who was first to conceive and last to practice, from a time prior to conception by the other.
We have interpreted the first sentence of subsection 102(g) to permit qualifying art to invalidate a patent claim even if the same art may not qualify as prior art under other subsections of § 102.
See, e.g., Checkpoint Sys., Inc. v. United States Int’l Trade Comm’n,
The cases that discuss skepticism of uncorroborated inventor testimony directed to establishing priority over an opponent’s patent claim involve situations where the inventor is self-interested in the outcome of the trial and is thereby tempted to “remember” facts favorable to his or her ease.
See, e.g., Barbed-Wire,
The clear and convincing standard of proof required to establish priority, along with the numerous methods in the Federal Rules of Civil Procedure and Evidence by which a party may test, challenge, impeach, and rebut oral testimony, normally protects patentees from erroneous findings of invalidity.
See Price v. Symsek,
In the current case, the purported inventors who testified were non-parties and their testimony concerned an unpatented prior invention. Although Thomson argues that the corroboration rule is justified here because both testifying witnesses were involved in businesses that supplied goods and services to Quixote, this does not rise to the level of self-interest required to justify triggering application of the corroboration rule. In fact, Thomson’s only reference to the record showing this potential source of bias is a transcript of Thomson’s cross examination of one of the witnesses, which means that the jury had the necessary facts to assess the credibility of the witnesses.
We therefore conclude that the district court was correct in holding that substantial evidence supports the jury’s finding that Quixote showed, by clear and convincing evidence, that every limitation in the representative claims was anticipated, and that the district court was correct in denying Thomson’s motion for JMOL.
Finally, because we hold that the testimony of the presumed MCA inventors did not have to be corroborated, we do not reach Thomson’s argument that Quixote’s expert’s claim charts and expert report are entitled to no weight.
Conclusion
In view of the foregoing, we affirm the district court’s decision to sustain the jury verdict and deny Thomson’s motion for JMOL.
Affirmed.
Notes
. Quixote Corp. is a holding company that until recently owned Disc Manufacturing Inc., a contract maker of video and audio CDs.
. Thomson does not directly attack the district court’s claim construction, so claim construction is not an issue before us.
. The interpretation of subsection 102(g) to provide a prior art basis for invalidating a patent claim in infringement litigation was not intended by the drafters of the 1952 Patent Act. As the second sentence in the subsection indicates, 102(g) was written merely to provide a statutory basis for determining priority of invention in the context of interference proceedings before what was then the United States Patent Office. See P.J. Federico, Commentary on the New Patent.Act at 19, in 35 U.S.C.A. (1954 ed., discontinued in subsequent volumes) (reprinted in 75 J. Pat. Trademark Off. Soc’y 161, 180 (1993)). Nevertheless, the first sentence is clear and, as the cases show, has been taken to have independent significance as a basis for prior art outside of the interference context.
This result makes sense. The first to invent who has invested time and labor in making and using the invention — but who might have opted not to apply for a patent' — will not be liable for infringing another’s patent on that same invention, while the public will have benefited because the invention was not abandoned, suppressed or concealed. However, in view of these and other related policy concerns, and amendment of the statute, we have made clear that art qualifying only under subsection 102(g) may not be used under § 103 to invalidate other patents of fellow employees engaged in team research.
See Oddzon Prods., Inc. v. Just Toys, Inc.,
. Thomson incorrectly argues that we extended the corroboration rule to include non-inventors in
Woodland Trust.
In
Woodland Trust,
the infringement defendant argued that the patent claims at issue were invalid under 35 U.S.C. § 102(a), testifying that the claims had been anticipated by his prior invention and public use. Thus, the corroboration rule was properly applied to the testimony of the defendant because he was a
party
who claimed to be an
inventor. See Woodland Trust,
. This includes
In
re
Reuter,
