Read What the Complementary Mos Patent Actually Claimed as Its Legal Scope

# Read What the Patent Actually Claimed

## 1. The Claim Language, in Substance

The patents claims describe a complementary pair of field-effect devices of opposite conductivity type, connected so that their combined switching behavior yields near-zero steady current in either static logic state. This is, in substance, an electrical-topology and polarity claim: it protects the arrangement and the resulting electrical behavior, not any particular way of manufacturing the two device types side by side on one piece of silicon.

## 2. What the Claim Did Not Cover, and Why That Gap Mattered Later

Because the claim covered the circuit arrangement rather than a specific fabrication process, it left open exactly how a manufacturer should actually build both device polarities on the same substrate — the well-diffusion and dual-well process engineering that the already-deployed `cmos_logic_1980s` series covers as its own separate technical story. That gap is not a flaw in the patent; it simply means the 1963 filing protected an idea, while the much harder question of how to manufacture that idea affordably was left for others, including Fairchild itself, to solve over the following years.