Red Rhino Leak Detection, Inc. v. Anderson Manufacturing Company, Inc.

Background

This was the second patent-infringement case in the District of Minnesota involving Red Rhino and Anderson. Red Rhino alleged that Anderson’s Light Tester and LeakTrac Light Cover Version 2 infringed U.S. Patent No. 10,088,383, a continuation-in-part of an earlier patent. Anderson requested claim construction under Markman v. Westview Instruments, which means that the court, rather than a jury, determines the legal meaning of disputed patent terms.

The parties disputed three terms: “an inlet . . . to selectively deliver a dye solution for leak detection purposes into the interior of said housing”; “threaded rod”; and “opaque material.”

Selective dye delivery

Anderson proposed construing the inlet language to require deliberately injecting or forcing dye into the inside of the housing. Red Rhino argued that issue preclusion required the court to use the construction from the earlier related case. Alternatively, Red Rhino argued that no construction was necessary or that the phrase should not require deliberate injection or forced delivery.

The court held that issue preclusion did not apply to this term because the wording and context of the ’383 Patent differed materially from the earlier patent. In the earlier case, “selectively deliver” and “deliver a dye solution” appeared as separate functions, and their relationship affected the construction. In the ’383 Patent, those concepts were combined into a single phrase.

The court construed “an inlet . . . to selectively deliver” to mean an inlet allowing an operator to select among options for delivering dye into the interior of the housing. The specification described both using a hose so that natural forces could draw dye through the inlet if there was a leak and injecting dye through the inlet with a syringe or similar device. The court concluded that the construction accounted for both options. It rejected Anderson’s proposed construction because requiring forced injection would make “selectively” unnecessary and would exclude delivery methods relying on natural forces.

Threaded rod

Anderson argued that “rod” could mean either a solid or hollow threaded rod. Red Rhino argued that issue preclusion required the court to follow the earlier construction, which interpreted “rod” as solid rather than hollow. Red Rhino alternatively argued that the ordinary meaning of “rod” or “solid shaft” was sufficient.

The court applied issue preclusion to this dispute. It found that Anderson had been a party to the earlier case, the issue was the same, the issue had been litigated and decided, the decision was essential to the earlier judgment, and the earlier case ended in a valid and final judgment. The court rejected Anderson’s argument that later-presented prosecution history justified reconsideration, explaining that the prosecution history had been available during the earlier claim-construction proceedings.

The court therefore construed “threaded rod” to mean a threaded solid, not hollow, rod.

Opaque material

Anderson proposed defining “opaque material” as material that cannot itself be seen through but has features allowing visual observation of dye movement. Red Rhino argued that the phrase needed no construction and should receive its plain and ordinary meaning.

The court agreed that “opaque” ordinarily means impenetrable by light and neither transparent nor translucent. But it found that the real dispute concerned whether the housing had to be entirely opaque or could be partly transparent while still being described as made of opaque material.

The court construed the language to mean that the housing is made of opaque material, though not entirely, so that an operator can observe the housing’s interior. It relied on claim 1’s requirement that the flow of dye inserted into the interior be observable and on the specification’s descriptions of opaque housings with transparent panels, a sight glass, or a transparent inlet.

Disposition

Judge Eric C. Tostrud ordered that the disputed terms of U.S. Patent No. 10,088,383 be construed as set forth in the opinion. The opinion was a claim-construction ruling; it did not state a determination about whether Anderson’s products infringed the patent.