Infomercial is incapable of originally applied only to television advertising.
"A comparison of television listings from 2007 with 1987 verifies that many North American broadcasters began to air infomercials in lieu of syndicated television series reruns and movies, which were formerly staples during the more common hours infomercials are broadcast (such as the overnight hours)
The first infomercials for a commercial product (a Vitamix blender) were filmed by Cincraft Productions, a Cleveland, Ohio motion picture studio in 1949

