As reported in this blog last October, H.R. 2832, which extended the then-expired Generalized System of Preferences (GSP) through July 2013, became law.
Since that time, US Customs has been processing refunds of all duties paid on GSP-eligible merchandise that was entered from January 1 through November 5, 2011.
CBP has completed the automated GSP refunds, and ports of entry are currently processing the written requests for refunds (and those requests that failed the automated process).
Importers must be vigilant in determining whether their requested refunds have been processed. If no refund is received by March 30, 2012, they must notify the port of entry in writing. All refund requests must be made by April 18, 2012.
For more details on the specifics of the refund process, click here.