Judge invalidates Sonos patents, hands Google victory in speaker group lawsuit

Federal judge ruled two Sonos patents unenforceable and invalid in dispute over smart speaker features.
Sonos accused Google of infringing patents related to grouping together smart speakers, sought over $30 million.
Judge criticized Sonos for unreasonable delay in filing patents and connecting them to older application.
Google restoring functionality removed earlier and calling for patent reform.
Sonos plans to appeal decision while Google touts win over "spurious" claims.