https://patentbrief.org/company/philips-broadcast-equipment-corp Plain-English explanations of patents assigned to Philips Broadcast Equipment Corp, newest first. en-us Sat, 13 Jun 2026 10:11:46 GMT https://patentbrief.org/patent/us/3678182/chroma-key-green-screen A 1971 circuit design that allowed television equipment to detect a specific color in a video signal, enabling the green-screen effects we see in modern weather forecasts and movies. Tue, 18 Jul 1972 00:00:00 GMT https://patentbrief.org/patent/us/3678182/chroma-key-green-screen