The California firm that SAGE Electrochromics Inc. filed a patent lawsuit against in late December has now filed a counterclaim, saying the Faribault-based company is actually using its methods for tinting glass.

According to a statement released by View Inc., company officials there believe it is SAGE that is infringing on a patent that View Inc. owns titled “Fabrication of Low Defectivity Electrochromic Devices.” View Inc. (formerly Soladigm, Inc.) of Milpitas, Calif., manufactures View Dynamic Glass, an intelligent glass system for buildings.

The counterclaim is part of a response to SAGE’s lawsuit, which was filed Dec. 20 in U.S. District Court, Northern District of California and said that View Inc. is infringing on two patents SAGE owns.

According to a statement issued by Jane Park of Ogilvy Public Relations Worldwide, View Inc. also responded to SAGE’s lawsuit by asserting that SAGE’s patents are invalid and not infringed on by View.

View seeks damages and injunctive relief for the infringement of its patent.

“View intends to defend its rights in the litigation and does not believe it is liable to SAGE for infringement of any valid claim of any patent,” the statement read.

Chuck Hayes, senior vice president at SAGE, said the response from View was expected.

“It’s a very standard reply — deny everything and throw something up in an attack,” Hayes said. “SAGE has been the innovator of electrochromics. We were making and shipping low defect glass long before View filed the patent they’re asserting they did.”

Hayes said the lawsuit has no affect on operations at SAGE, which holds 236 patents globally with more pending related to the manufacture of electronically tintable glass that can be tinted or cleared to optimize daylight.

“We have a duty to defend our intellectual property rights — that’s how this started, with us defending our rights,” Hayes said. “These things take years to complete, but we’ll continue moving forward while our legal team handles this.”

Reach reporter Rebecca Rodenborg at 333-3128, or follow her on @FDNRebecca

Reach reporter Rebecca Rodenborg at 333-3128, or follow her on @FDNRebecca