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Gentex Corp. v. Donnelly Corp., 69 F.3d 527, 36 U.S.P.Q.2d 1667

Facts

Gentex Corporation, the maker of automobile rear view mirrors with variable reflectance, brought a patent infringement action against Donnelly Corporation, a competitor. The dispute centered around Gentex's U.S. Patent No. 5,128,799, which described a mirror that utilized a solution between two pieces of glass as an electrochromic element. Donnelly introduced a new line of mirrors using solid polymer films instead of the solution, prompting Gentex to claim infringement. The United States District Court for the Western District of Michigan granted summary judgment of noninfringement in favor of Donnelly.

In March of 1993, Donnelly brought out a new line of chemichromic mirrors in which it had changed the construction from those involved in the prior suit. Instead of using a color-changing liquid it used a solid film located in the same chamber where the liquid had been placed and operating in the same general way.

Issue

Did Donnelly's new mirrors infringe Gentex's '799 patent, which is limited to devices with electrochemical reactions occurring entirely in solution?

Do the patent claims cover mirrors wherein the color-changing, electrochromic element is a solid film?

Rule

The interpretation of patent claims is a question of law, and words in patent claims are to be given their ordinary meaning unless indicated otherwise in the patent. Infringement of a patent claim is an issue of fact, but if there is no genuine issue of material fact, a court may grant summary judgment. The '799 patent specifically limits its claims to devices where the electrochromic element is a solution-phase material.

Words in claims are to be given their ordinary meaning in the absence of indication in the patent to contrary. Claim interpretation is a question of law amenable to summary judgment.

Analysis

The court analyzed the claims of the '799 patent and determined that they explicitly required the electrochromic element to be in a solution-phase. Donnelly's mirrors, which utilized solid polymer films, did not meet this requirement. The court found that Gentex's arguments that the solid films were essentially gels or that they functioned similarly to solution-phase devices were unconvincing. Therefore, the court concluded that there was no infringement.

The claims being thus limited, the only question remaining is whether this limitation is met by Donnelly's new devices, at issue herein, wherein the electrochemichromic elements are in the form of solid films.

Conclusion

The court affirmed the summary judgment of noninfringement, concluding that Donnelly's mirrors did not meet the 'solution-phase' limitation of Gentex's patent.

The Court finds as a matter of law that it is not.

Who won?

Donnelly Corporation prevailed in this case as the court found that their mirrors did not infringe upon Gentex's patent. The court's ruling was based on a clear interpretation of the patent claims, which limited the scope to devices utilizing a solution-phase electrochromic element. Since Donnelly's mirrors used solid films, they did not fall within the patent's claims, leading to the conclusion that there was no infringement.

The trial court summed up its primary reason for granting the summary judgment of noninfringement as follows: The Donnelly polychromic mirrors are not 'solution-phase' as a matter of law.

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