The falling domino chain engendered by the downfall of Lumen’s CDN business has now hit Google, which has been slapped earlier this month with a patent infringement lawsuit by revenant Sandpiper CDN, in the US District Court for the Central District of California. The patents involved previously belonged to Lumen-owned Level 3 Communications. These patents were bought in March this year by Sandpiper CDN, named as an effigy of a veteran in the CDN business, considered to have built one of the first public CDNs in the late 1990s. The pioneer Sandpiper Networks was bought by Digital Island in 1999, and sold its patented technology to Level 3 in 2007. Some 17 years later, the Sandpiper name has reemerged, taking…