Real estate and loan data aggregator CoreLogic is suing Seattle-based online brokerage Redfin Corp. and two real estate analytics and valuation companies, Collateral Intelligence LLC and Collateral Analytics LLC, alleging the property valuations they provide infringe on a patent issued to CoreLogic in 1994.

CoreLogic previously filed lawsuits under the same patent against 11 other real estate companies in 2010. Since then, CoreLogic has settled with six of the companies: Intellireal LLC, Precision Appraisal, Zillow, Lender Processing Services, RealEC Technologies Inc. and Espiel Inc.

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