home-price.jpgIPNews® – The fight over a patent for online home appraisal systems continues between Zillow and Trulia as both spar in federal court.

Zillow originally filed its lawsuit against Trulia for patent infringement, claiming Trulia’s home valuation service resembled its own program too closely.  Trulia countered, arguing Zillow’s patent is merely for an abstract idea

brick_house.jpgIPNews® – Zillow Inc. accused its rival real estate information website operator Trulia Inc. on Wednesday of ripping off its patented method for automatically refining home valuations based on input from homeowners and other users.

The complaint in Seattle federal court alleges that Trulia.com’s “Trulia Estimates” service introduced in September 2011 infringes a patent Zillow