Guardian Sues AT&T, Microsoft Over V-Chip Patents
Longview, Texas-based Guardian Media filed its complaint in the U.S. District Court for the Eastern District of Texas, asserting U.S. Patent Numbers 4,930,158 and 4,930,160.
Both patents, which Guardian Media has asserted in other cases, are now expired, the complaint states.
The '158 patent, titled "Selective video...
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