Leading producer of disposable and limited-use protective apparel products for the medical, dental and food service industries, Alpha Pro Tech Ltd, posted flat sales and a slide in pre-tax profits on Tuesday. The Arizona-based company said full-year sales remained flat at around $21.3 million but net income fell 46 per cent to $786,000, or three cents a diluted share, compared to $1.4m, or six cents a diluted share, for the year ended December 31, 2000.