You need to look at 35 USC 102. http://www.law.cornell.edu/uscode/text/35/102 I am assuming the patent filing date on 28th March 2012 is for a foreign patent. If that patent application qualifies as prior art, any attempt to obtain a US patent on the same invention will be futile. If that patent application does not qualify as prior art, then it should not be a barrier to patent, keeping in mind that the first to invent rules are gone and any intervening event that disclosed the invention will be prior art against you.
Good luck
Answered on Sep 19th, 2013 at 8:20 AM