AN F900 CREW; TAXIING FOR TKOF AT SJC; INCURRED RWY 30R WITHOUT A CLRNC.

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OUR FLT PROFILE WAS A DEADHEAD FLT FROM SJC TO LAS. WE PREPARED FOR THE FLT WITHOUT ANY COMPLICATIONS AND I PLACED ONE OF OUR NEW TYPE RATED PLTS IN THE L SEAT AND I WAS TO BE THE PNF. WE DISCUSSED THE PROFILE AND CLRNC AND PROCEEDED THROUGH THE CHKLIST THROUGH ENG START. COMPLETING ALL REQUIRED ITEMS; WE CALLED FOR TAXI AND RECEIVED A CLRNC TO TAXI TO WHAT I BELIEVED WAS RWY 30L; WHICH I DID NOT QUESTION AS THE R HAD BEEN CLOSED FOR REPAIRS AND THIS WAS A COMMON CLRNC FROM THIS AREA OF THE ARPT. THE PF CONCURRED AND WE PROCEEDED TO TAXI AND THE CTLR CONFIRMED A FLOW TIME RESTR OF WHICH WE HAD NOT RECEIVED BUT HE INDICATED THAT IT DID NOT AFFECT OUR FLT. WITH THIS NEW DISTR; I CAN NOT FULLY CONCLUDE THE ISSUE OF THE TAXI CLRNC. I USUALLY WOULD CONFIRM THE XING OF A RWY REGARDLESS OF THE SIT; BUT I DID NOT THIS TIME. WE REACHED THE APCH END OF RWY 30R AND CONTINUED THE TAXI ACROSS THE END OF THE RWY AFTER CHKING FOR APCH TFC WITH THE PLAN OF HOLDING SHORT OF RWY 30L AS WE BELIEVED THE CLRNC TO BE. I CONTACTED THE TWR 1/2 WAY ACROSS RWY 30R AND HE ASKED US TO MAKE A L 270 DEG TURN ON RWY INTO POS AND HOLD FOR DEP. NOTHING MORE WAS SAID; BUT WE KNEW WE HAD INCURRED THE RWY AND I EXPRESSED MY MISUNDERSTANDING AND NO OTHER INDICATION WAS MADE BY THE TWR EXCEPT THAT WE WERE CLRED FOR TKOF AND A VERY COURTEOUS HDOF TO DEP. WE DID NOT PURSUE THE SIT AS WE WOULD IF THE TWR HAD INDICATED TO DO SO. MY ASSUMPTION IS THAT THERE WERE HONEST MISTAKES MADE ALL AROUND AND WE SHOULD ALL LEARN A LESSON FROM. SUPPLEMENTAL INFO FROM ACN 542548: ALTHOUGH FAMILIAR WITH THE ARPT'S RWY AND TXWY LAYOUT; WE TAXIED TO RWY 30L RATHER THAN RWY 30R. AS I APCHED THE HOLD LINE FOR RWY 30R; I QUERIED THE PNF ON THE TAXI INSTRUCTIONS. AT THAT POINT I SHOULD HAVE CONFIRMED WITH GND CTL BEFORE PROCEEDING ANY FURTHER. THIS IS NOW PART OF MY PERSONAL SOP.