Tolliver was claimed off waivers by the Angels on Saturday, MASN's Roch Kubatko reports.
The O's ruled Tolliver out for a September promotion and subsequently designated him for assignment, but the Angels have deemed him worthy of a spot on their 40-man roster. While Triple-A Salt Lake's season is still going on, Tolliver figures to join the Angels' expanded major league roster right away to bolster their bullpen depth.