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Appealed from: United States District Court for the Eastern District of Virginia Judge Jerome B. Friedman

Bell Atlantic Network Services, Inc. (“Bell Atlantic”) is the owner of United States Patent No. 5,812,786 (“the ’786 patent”), which concerns certain data transmission services, particularly certain digital subscriber line (“DSL”) services. *fn1 In 1999, Bell Atlantic brought this patent infringement action against Covad Communications Company, Inc., DIECA Communications, Inc., and Covad Communications Group, Inc. (collectively “Covad”), alleging that certain DSL services offered by Covad infringe the ’786 patent. On April 4, 2000, the United States District Court for the Eastern District of Virginia (“district court”) determined that certain limitations required by claims 1 and 21 of the ’786 patent are not present in Covad’s DSL systems either literally or under the doctrine of equivalents, and granted Covad’s motion for summary judgment of noninfringement. Bell Atlantic Network Servs. v. Covad Communications Group, Inc., No. 2:99cv712, slip. op. at 28 (E.D. Va. Apr. 4, 2000). Bell Atlantic appeals that judgment.

For the reasons discussed below, we affirm.

 
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