SANDS POINT, N.Y. (AP) _ Alexander M. Lewyt, an inventor who developed a vacuum cleaner designed to operate without interfering with TV or radio reception, has died at age 79.

Lewyt died on Friday.

Born in New York, Lewyt was the son of an Austrian immigrant who ran a gadget shop.

He held patents on scores of inventions.

When he learned of undertakers' difficulty in fastening neckties on corpses, the teen-age Lewyt devised a new kind of bow tie that clipped on. He sold 50,000 of them. It was unclear whether he ever patented the concept.

He was best known for the compact Lewyt vacuum cleaner, which had no dust bag and was designed not to cause interference.

In the first eight years after his vacuum cleaner was introduced after World War II, Lewyt Corp. sold 2 million of them. During the war, Lewyt Corp. did a multi-million dollar business making such things as radar antennas and popcorn poppers.

Lewyt sold his interest in the company to the Budd Corp. in the 1950s.