[92] Early 1965 brought the first signs of management problems.[93] In November 1965, the creators of integrated operational amplifiers Bob Widlar and David Talbert left for National Semiconductor.[94] In February 1967, they were followed by five top managers who disagreed with Noyce.[95] Noyce started litigation with shareholders and effectively removed himself from the operational management.[93] In July 1967, the company became unprofitable and lost their leading position in the market to Texas Instruments.[95]