Birchtech Corp. (AMEX:BCHT) , the cleantech company focused on sustainable air and water treatment, debuted on the NYSE American exchange after uplisting from the over-the-counter market, following the completion of a reverse stock split and announcing a public offering of about 6.25 million shares of common stock.The public offering of 6,250,000 shares of common stock was at an assumed price of $2.40  per share, valuing shares at a total of about $15  million based on the last reported sale price on Januar ...