INVESTMENT PARTNERSHIP UPS FACET <FCT> STAKE Charter Oak Partners, a Connecticut investment partnership, said it raised its stake in Facet Enterprises Inc to 480,000 shares, or 9.6 pct of the total outstanding common stock, from 300,000 shares, or 6.0 pct. In a filing with the Securities and Exchange Commission, Charter Oak said it bought 180,000 Facet common shares on June 12 at 18.25 dlrs each.