Oct 19 - Standard & Poor's Ratings Services today said the ratings and outlook on Capital One Financial Corp. (COF; BBB/Negative/--) are unchanged following our review of the company's good third-quarter 2012 earnings, which were within our expectations. The company posted pretax earnings of $1.72 billion, up from $236 million in the previous quarter and $1.24 billion in third-quarter 2011. Total net revenue rose 14.4% from the second quarter and 39.2% year over year, reflecting the full qua