我发现美国专利patent number为5332724在2006 38期期刊里面公告了expiration of patents里的patents which expired of July 26,2006 due to failure to pay maintence fees有5332724;但是在2007 30期delayed payment of maintenance fee里面的patents reinstated due to the acceptance of a late maintence fee 也有5332724,是为什么呢?