US 5,850,218 · Granted 1998-12-15

The Patent That Made Your Cable Box Interactive

In the late 1990s, Time Warner patented the brain and guts of the cable set-top box — the device that sits on top of your TV. It describes how a single box could handle live TV, on-demand movies, pay-per-view, web browsing, and email all at once, switching between digital and analog signals so it wouldn't break older TV systems.

Curated and verified by the IsItPatented Editorial team

The plain-English version

What it protects

The claim covers a complete set-top terminal architecture that combines a digital processor, unified memory system, communications hardware, and input/output control circuitry to deliver multiple services (live TV, video-on-demand, internet access, pay-per-view) through a single device. What's protected here is the specific integration of these components and the method of transmitting both digital and analog signals through the same cable infrastructure to maintain backward compatibility.

Why it matters

This patent represents a foundational infrastructure piece for the cable industry during the transition from analog-only television to digital interactive services. By protecting the architecture of the set-top box itself — rather than just one feature — Time Warner secured intellectual property covering the hardware that powered cable's shift toward on-demand programming, internet services, and interactive guides. This was critical technology during the late 1990s race to bundle television, internet, and emerging streaming services into one device.

Real-world use

Every time you flipped through an interactive cable guide in the late 1990s and early 2000s, or ordered a pay-per-view movie without calling a phone number, you were using circuitry and software designed under this patent framework.

Original USPTO abstract

A system and method are provided for providing a full service cable television system. The cable system incorporates a digital and analog transmission architecture capable of delivering a high number of high quality television programs, advanced cable services, and online services to a subscriber's home. The cable system comprises a cable headend, at least one fiber transport, at least one distribution hub, at least one hybrid fiber coax plant, and a plurality of set-top terminals. Programs and services are transmitted to the set-top terminals in both digital and analog formats to maintain downward compatibility with existing systems. The set-top terminal incorporates a central processing unit, a unified memory architecture, a memory management unit, communications circuitry, I/O control circuitry, and audio and video output circuitry. Through these components the set-top terminal provides advanced cable services such as a comprehensive channel navigator, an interactive program guide, Impulse Pay-Per-View activation, Near-Video-On-Demand and Video-On-Demand programming, and advanced configuration controls. The set-top terminal also provides online services such as World Wide Web browsing, Internet E-Mail, and Home Shopping.

Patent details

Publication number: US 5,850,218
Filing date: 1997-02-19
Grant date: 1998-12-15
Assignee: Time Warner Entertainment Company L.P.
Inventor(s): LAJOIE; MIKE L., BUEHL; JOSEPH G., KRAKIRIAN; HAIG H., JOHNSON; STEPHEN M., BROWN; RALPH W.
CPC class: H04N21/4622

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