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Traffic Signal Patent (US1475024)

Garrett Morgan

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1923

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Innovators

3-Minute Summary

Morgan's three-position traffic signal — adding a caution position between stop and go — became the model for modern traffic control systems worldwide. He also invented the gas mask, which saved lives in World War I and in industrial accidents.

Why It Matters

Morgan's traffic signal is one of the most consequential safety inventions in American history. He sold the patent to General Electric for $40,000 — a fraction of its value — in a transaction that reflects the systematic undervaluation of Black intellectual property.

Where to Read

USPTO Patent Full-Text Database (free)

Verified: USPTO

Key People

Garrett Morgan

General Electric

Key Policies & Events

Patent lawTraffic safety regulationsIndustrial safety standards