Alfred M. Moen, 84, died April 17 at his home in Destin, FL. He was best-known for his invention of the single-handle mixing faucet. Its creation eventually led to the formation of Moen Inc. Mr. Moen's business card identified him as "inventor," and he headed Moen's research and development group until his retirement in 1982. Mr. Moen held 75 patents, including the replaceable cartridge (eliminating washers), the screen aerator, push-button shower valve diverter, swivel spray, pressure balancing shower valve and flow control aerator. He also held many patents in fields unrelated to plumbing.