TechCrunch and Wired/Threat Level have details on a Texas firm’s claim.
Incidentally, and as a reminder, you can follow this site on Twitter at @overlawyered (a mix of auto-Tweets of new posts, and original links/material), and my personal account at @walterolson (some law-related content, some other). Point of Law, where I also post, has an account too.
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[…] Apparently plaintiff TechRadium asserts patent rights over emergency notification systems, and Twitter came into its cross-hairs because, among its many, many other uses, it permits municipalities and other users to warn affected persons of emergencies. [Elefant, Legal Blog Watch; earlier] […]