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Search giant Google is nearly always on the defense when it comes to patent litigation. Last year, however, Google subsidiary Motorola filed suit against Apple over patents—part of the ongoing smartphone patent wars. Motorola has made patent claims against Microsoft as well.

Now, Google has filed what appears to be a patent infringement suit under its own name, against British Telecom. The British phone company sued Google over a year ago, alleging a wide range of Google products infringed its patents.