First microprocessor

First microprocessor commercially available and sold as a component set

According to Nick Tredennick, a recognized engineer and microprocessor designer, and an expert witness to the Boone/Hyatt patent case:

Here are my opinions from [the] study [I conducted for the patent case]. The first microprocessor in a commercial product was Four Phase Systems AL1. The first commercially available (sold as a component) microprocessor was the 4004 from Intel.[3]