SPD DEV DURING LOOP DEP FROM LAX ARPT.

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DEPARTED LAX WITH VISUAL SEPARATION ON AN ACR 727. DEP RESTR ACR TO 250 KTS. I OUTCLBED HIM AND WITH 2500 PLUS FT ALT SEPARATION AND ACR TURNING TO THE SE; I RECEIVED CLRNC TO LOOP BACK TO LAX VOR AS PER LOOP DEP. I WAS LEVEL ABOUT 5 MI NE OF LAX AND ACCELERATED TO CRUISE SPD OF 320 KTS. HDOF TOOK PLACE ABOUT 10 MI PAST THE VOR TO SOCAL. HE DID NOT CLB US. ABOUT A MIN LATER; HE ASKED IF WE WERE STILL DOING 250 KTS. HE APPARENTLY EXPECTED US TO BE AT 250 KTS. COMMENTARY: AT MY AIRLINE; WE USE THE PHRASE 'CALIFORNIA SPD LIMIT.' THIS MEANS '250 KTS UNTIL ADVISED.' THIS SPD LIMIT IS USUALLY IMPOSED BY CLRNC DELIVERY. NOT SO IN THIS CASE! SOMETIMES IT IS LEVIED BY TWR OR DEP. AGAIN HERE; I DON'T THINK SO. MY POINT: IF ATC ROUTINELY IMPOSES SPD RESTRS; PUT IT IN WRITING ON THE DEP PLATE. MY GUESS IS SOME ATC PERSON WAS SUPPOSED TO RESTRICT US AND DIDN'T. IT IS 'RESUME NORMAL SPD' WITH SOCAL 80 PERCENT OF THE TIME; SO PUT THE 250 KT SPD LIMIT ON LAX; SFO; BUR; OAK; SJC SIDS. IT IS QUICK AND EASY TO DELETE IT; AND SOCAL AND BAY APCHS NEED IT.