CAPT OF A LEARJET LOST CTL DURING LNDG ROLL DUE TO TOUCHING DOWN ON AN ICY PATCH ON THE RWY RESULTING IN THE ACFT VEERING OFF THE EDGE OF THE RWY ONTO A GRASSY MIDFIELD AREA. THERE WAS NO ACFT OR PROPERTY DAMAGE.

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MY FO WAS FLYING THE APCH. HE WAS ON A STABILIZED APCH; THE ATIS RPTED RWY 23 AS ACTIVE RWY AT 9 KTS; AND NO RPTS OF ICE. INSIDE THE OM; THE FO GAVE ME POSITIVE CTL OF THE ACFT. I CONTINUED THE APCH. I WAS ON A STABILIZED APCH ON RWY CTRLINE (VISUAL APCH). I ASKED FOR A WIND CHK AND WAS TOLD WIND WAS AT 15 KTS -- WELL WITHIN ALL PARAMETERS AND LIMITATIONS OF MY ACFT. UPON TOUCHDOWN; DUE TO THE WINDS; I TOUCHED DOWN ON THE RWY CTRLINE PUTTING MY R MAIN DOWN FIRST (AILERON INTO WIND AND RUDDER) TO STAY ALIGNED WITH RWY CTRLINE. ON ATIS AND RPTS FROM TWR; NO INDICATION OF ICE ON RWY PRIOR TO TOUCHDOWN. (ICE PATCH THAT CAUSED THIS INCIDENT WAS VISUALLY VERIFIED BY MY FO; MYSELF; THE FIRE CHIEF; THE NEWSMAN ALSO VERIFIED ICE PATCH ON RWY THAT WAS NOT SANDED FROM INTERVIEW WITH MAINT CREW FROM ARPT.) BEFORE I COULD PUT MY L MAIN DOWN; THE ACFT SKIDDED ON ICE AND VEERED TO THE L SHARPLY AND ABRUPTLY. I RAN OFF OF THE RWY AND GAINED CTL OF ACFT; DEPLOYED SPOILERS AND THRUST REVERSERS; KEPT ACFT STRAIGHT. DID NOT HIT ANY RWY LIGHTS OR SIGNS; NO DAMAGE TO ACFT. PERFORMED OFF-RWY INSPECTION ACCORDING TO CHAPTER 5 OF THE LEARJET MAINT MANUAL. NO DAMAGE DONE TO ACFT; NO INJURIES TO CREW ONBOARD; NO DAMAGE TO PROPERTY. THE PROB WAS CAUSED BY THE PATCH OF ICE ON THE RWY. ICE WAS NOT SEEN NOR EXPECTED PRIOR TO TOUCHDOWN. OTHER CONTRIBUTING FACTOR WAS XWIND.