Federico Faggin's Signature
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The Intel 4004 Microprocessor and the Silicon Gate Technology
A testimonial from Federico Faggin, designer of the 4004 and developer of its enabling technology
Federico Faggin's Signature in the Production 4004
Each 4004 ever produced is etched with the initials of its designer, F.F. for Federico Faggin. The signature is visible directly across from the Intel logo. The Intel logo has the copyright symbol and the date '71. Faggin created the design and led the design development of the 4004 and its companion chips from inception to production.
Faggin also christened the chips with distinct names: 4001, 4002, 4003 and 4004, breaking away from the numbering scheme used by Intel at that time. According to that scheme, the chips would have required the names 1302, 1105, 1507 and 1202 respectively, not giving the sense that they were part of a coherent family of components.

Federico Faggin's Initials etched on the edge of the 4004
Picture of Federico Faggin's initials etched on the edge of the production 4004.
Federico Faggin's Signature in the Pre-Production 4004
In the pre-production 4004, Federico Faggin placed his initials inside the 4004. A few months later he moved his signature to the border of the chip because he needed to use the area where the signature was to add additional circuits. The pre-production mask can be recognized because the F.F. is missing from the border across the Intel logo, and the logo is without the copyright symbol and the date '71.

Picture of Federico Faggin's initials etched inside the 4004
Picture of Federico Faggin's initials etched inside the pre-production 4004.

Framed picture of the 4004: gift from Intel to Federico Faggin in occasion of the 40th birthday of the first microprocessor
Framed artwork of the 4004 silicon and metal masks: gift from Intel to Federico Faggin in occasion of the 40th birthday of the first microprocessor.


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