Facebook is being sued by Rembrandt Social Media over the use of the "Like" button and other features on the social network.
Rembrant is suing the social network on behalf of deceased Dutch programmer, Joannes Jozef Everadus van Der Meer.
The lawsuit says Facebook infringed upon two Rembrandt patents and another by social media firm, Add This.
Fish & Richardson said both patents originally were issued to inventor "Jos" van der Meer more than 10 years ago.
Fish and Richardson lawyer, Tom Melsheimer said: "We believe Rembrandt’s patents represent an important foundation of social media as we know it, and we expect a judge and jury to reach the same conclusion based on the evidence."
According to the BBC, Facebook said it had no comment to make on the lawsuit or its claims.
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