Key Energy Sued Over Oil Drilling Patent

Law360 (November 16, 2007, 12:00 AM EST) -- Key Energy Services Inc. has been hit with a lawsuit alleging infringement of a patent related to drilling for oil, which covers a method for wellbore window drilling — drilling sideways through the metal casing that keeps a borehole from caving in.

Whipstock Services Inc. filed its complaint Thursday in the U.S. District Court for the Eastern District of Texas. The complaint accused Key Energy of offering for sale, selling or using a method that provides whipstock and milling services that infringe on the patent at...
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