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Gambro Lundia AB v. Baxter Healthcare Corp., 110 F.3d 1573, 42 U.S.P.Q.2d 1378

Facts

Gambro Lundia AB (Gambro) filed a patent infringement lawsuit against Baxter Healthcare Corporation (Baxter) regarding U.S. Patent No. 4,585,552, which pertains to a system for measuring the difference between two fluid flows in separate ducts during hemodialysis. The district court ruled the patent invalid due to obviousness, derivation, and inequitable conduct. Gambro appealed the decision, arguing that the patent was valid and enforceable.

The trial judge found that Gambro had derived the '552 invention from a Wittingham proposal left in the files when Gambro acquired Repgreen's dialysis technology.

Issue

Whether the patent was invalid on grounds of derivation, obviousness, and inequitable conduct.

Whether the patent was invalid on grounds of derivation, obviousness, and inequitable conduct.

Rule

To establish derivation, the party asserting invalidity must prove prior conception of the invention by another and communication of that conception to the patentee. The standard for obviousness requires that the prior art must teach, suggest, or motivate a person of ordinary skill in the art to combine elements in a way that would render the invention obvious. Inequitable conduct requires proof of intent to deceive the patent examiner.

To show derivation, party asserting invalidity of patent must prove both prior conception of invention by another and communication of that conception to patentee.

Analysis

The court found that the evidence presented by Baxter was insufficient to prove derivation, as the Wittingham proposal did not clearly disclose the concept of recalibration during dialysis. The court also determined that the prior art did not suggest the use of valves for recalibration during dialysis, thus supporting the conclusion of nonobviousness. Furthermore, the court found that the evidence of inequitable conduct was not compelling enough to establish intent to deceive.

The only other evidence offered by Baxter to corroborate conception is the testimony of Mr. Smith, Wittingham's supervisor at Repgreen. Referring to the ambiguous sentence, Smith testified that the Wittingham proposal included the idea of calibration during dialysis. The trial judge, however, did not rely on this self-serving testimony in finding prior conception.

Conclusion

The Court of Appeals reversed the district court's ruling, holding that the patent was not invalid on the grounds of derivation, obviousness, or inequitable conduct.

Reversed.

Who won?

Gambro Lundia AB prevailed in the appeal, as the Court of Appeals reversed the district court's findings of invalidity and inequitable conduct. The appellate court determined that the evidence did not support the claims of derivation or obviousness, and that the district court had erred in its analysis of the patent's validity.

Gambro Lundia AB prevailed in the appeal, as the Court of Appeals reversed the district court's findings of invalidity and inequitable conduct.

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