A C310 CARGO PLT DEPARTS GAI; MD; EXPECTING TO BE ON AN IFR FLT PLAN WITH BWI DEP CTL BUT FLT PLAN WAS NOT ACTIVATED AS THE CLRNC VOID TIME WAS NEVER ASSIGNED TO FLT AT GAI; MD.

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OCT/WED/01 ON GND AT GAI; I CALLED CLRNC DELIVERY AND TOLD THEM I WAS IFR TO VYS. THEY CALLED BACK 'CLRED TO VYS VIA DIRECT WESTMINSTER V44 MRB; MAINTAIN 3000 FT; EXPECT 8000 FT IN 10 MINS; DEP FREQ 128.7; SQUAWK XXXX.' I READ IT BACK. APPROX 1 MIN LATER THEY CALLED AGAIN 'ACFT X; AMENDMENT TO YOUR CLRNC.' I SAID 'I'M READY TO COPY.' THEY SAID 'ACFT X FROM MRB TO VYS; FLY V44 MORGANTOWN V144 TO FORT WAYNE; CLRED.' I READ BACK THE AMENDED CLRNC AND NOTHING MORE WAS SAID. I TAXIED OUT TO RWY 32; DID MY RUN-UP; AND ANNOUNCED ON UNICOM THAT I WAS DEPARTING RWY 32. AFTER DEP; I TRIED CALLING BWI DEP ON 128.7. HE NEVER CALLED BACK. NOW I'M CLBING THROUGH 1600 FT MSL AND I CALLED HIM AGAIN 'BWI DEP; ACFT X CLBING OUT OF 2300 FT MSL.' HE CALLED BACK 'I DON'T HAVE A CLRNC ON YOU; MAINTAIN VFR;' AND I DID. I SAID I WAS CLRED TO DIRECT WESTMINSTER V44 MRB. HE SAID FLY HDG 180 DEGS; MAINTAIN VFR. HE THEN CALLED BACK WITH 'CLRNC DELIVERY THOUGHT YOU WERE STILL ON THE GND.' 'MY MISTAKE; I SHOULD HAVE REALIZED I HAD NO VOID TIME.' BUT IN THE PAST I'VE NEVER GOTTEN A CLRNC WITHOUT A VOID TIME; ESPECIALLY IF I'VE GOTTEN A SQUAWK CODE. ANYWAY; WHEN THEY GIVE A CLRNC LIKE THAT AT UNCTLED FIELDS AND WITH UNFAMILIAR PLTS AS WITH MYSELF; THEY SHOULD SAY 'CALL UP BEFORE YOU DEPART' AFTER THEY GIVE A CLRNC.