When did stan lee invent marvel superheroes?

Answer 1

Invent Marvel Superheroes? I'n not sure I understand the question. If you're asking when was Marvel Publishing created, well, here's what Wikipedia has to say:

Marvel Publishing, Inc., doing business as Marvel Comics, is an American comic book and related media company, and a subsidiary of Marvel Entertainment, Inc. Marvel counts among its characters such well-known properties as Spider-Man, the Fantastic Four, the Hulk, Thor, Iron Man, Captain America, the X-Men, and many others. Most of Marvel's fictional characters operate in one single reality; this is known as the Marvel Universe.

The comic book arm of the company started in 1939 as Timely Publications, and by the 1950s was generally known as Atlas Comics. Marvel's modern incarnation dates from 1961, with the launching of Fantastic Four and other superhero titles created by Stan Lee, Jack Kirby, Steve Ditko, and others. Marvel has since become the largest American comic book publisher over long time competitor DC Comics.

Stan Lee is a writer, he co-created most of Marvel's top comic icons with the help of a few other people(listed above). If you want to know "why," well, there's a cool little scene in the film Mallrats(directed by Kevin Smith - a huge Stan Lee fan), in which Stan Lee(playing himself) discusses why he created some of his most popular characters.