Yes and no. If the blog is of substantial character in the industry, it may satisfy the publication requirement. First off, do not rely on the definition of a publication in copyright for the definition of publication in patent law. Go see the MPEP instead: http://www.uspto.gov/web/offices/pac/mpep/documents/2100_2128.htm "A reference is proven to be a 'printed publication' 'upon a satisfactory showing that such document has been disseminated or otherwise made available to the extent that persons interested and ordinarily skilled in the subject matter or art, exercising reasonable diligence, can locate it.' In re Wyer, 655 F.2d 221"