As per the title, I wondered specifically which patents IBM has alleged Groupon has infringed upon, in its $167 million case: https://www.reuters.com/article/us-ibm-groupon-lawsuit/ibm-seeks-167-million-from-groupon-in-dispute-over-early-internet-patents-idUSKBN1K62VA

up vote 3 down vote accepted

According to this article, the patents allegedly infringed upon are: US5,796,967, US5,961,601, US7,072,849 and US7,631,346.

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