In November 1971, with the prophetic advert "Announcing a new era in integrated electronics", the 4004 was made commercially available to the general market. The 4004 was the first monolithic processor, fully integrated in one small chip. Such a feat of integration was made possible by the use of the new silicon gate technology for integrated circuits, originally developed by Faggin (with Tom Klein) at Fairchild Semiconductor in 1968, which allowed twice the number of random-logic transistors and an increase in speed by a factor of five compared to the incumbent MOS aluminum gate technology. Faggin also invented the bootstrap load with silicon gate and the "buried contact", improving speed and circuit density compared with aluminum gate.