H 1B Filing - Cooling Period

I stayed in USA on H 1B for 6 years, unfortunately my GC Process did not go through well which was filed in 6th year, so now moved on H4 and staying in USA itself. Just wanted to know is it mandatory to be outside of USA for >365 days to file new H 1B?.

I have completed my 6 years on April 28th 2013.