An invention promotion firm or invention submission corporation provides services to inventors to help them in develop or market their inventions. These firms may offer to evaluate the patentability of inventions, file patent applications, build prototypes, license them to manufacturers, and otherwise market. They are distinguished from more conventional consulting firms and law firms offering the same or similar services in that they market their services primarily to amateur inventors through the mass media.

The US government estimates that hundreds of companies offer invention-promotion services and that “virtually all of them are either ineffective or outright fraudulent. One official at the U.S. Patent and Trademark Office says he believes there are fewer than a half-dozen legitimate invention promoters in the country”.