Obviousness — US Patent US6098106

Obviousness Analysis of US Patent US6098106 under 35 U.S.C. § 103

Under 35 U.S.C. § 103, a patent claim is invalid if the differences between the claimed invention and the prior art are such that the invention as a whole would have been obvious at the time the invention was made to a person having ordinary skill in the art (PHOSITA). An obviousness rejection often arises from combining multiple prior art references, where a PHOSITA would have been motivated to combine their teachings with a reasonable expectation of success.

For the purposes of this analysis, a PHOSITA in September 1998 would be an engineer or computer scientist with knowledge of broadcast technologies (television, radio), computer networking (Internet, TCP/IP, HTTP), web browsers, and common data encoding and transmission methods, including data transmission over analog audio channels (e.g., modem technology).

Based on the prior art cited, the single independent claim (Claim 1) of US Patent US6098106 appears to be obvious. The claim's core concept—embedding a "routing signal" in a broadcast to direct a user's computer to a specific network location—is not novel. The prior art references teach all the essential elements, and the motivation to combine them to arrive at the specific implementation in the '106 patent would have been clear to a PHOSITA.

Primary Combination: US Patent 5,761,606 (Wolzien) in view of common knowledge of data-over-audio transmission

The invention described in Claim 1 of US6098106 would have been obvious by modifying the system taught by Wolzien ('606) with well-established data transmission techniques.

What Wolzien ('606) Teaches: Wolzien describes a system where data, specifically including URLs, is transmitted along with a television signal. A computer receives this data and automatically uses it to retrieve information from the specified network location. This directly teaches the core elements of Claim 1 of the '106 patent: broadcasting a program with an embedded routing signal (a URL) and using a computer to extract that signal to retrieve network-based information.
The (Minor) Gap to Bridge: The '106 patent emphasizes the use of an analog audio signal as the medium for the routing signal. Wolzien is broader and not necessarily limited to this specific method; it could also be implemented via data in the Vertical Blanking Interval (VBI) or a digital sub-carrier.
Motivation to Combine: A PHOSITA tasked with implementing the system in Wolzien ('606) would have been motivated to use an audio tone for several reasons, making it an obvious design choice:
1. Hardware Ubiquity: By 1998, personal computers were commonly equipped with sound cards capable of receiving and digitizing analog audio input. Likewise, televisions and VCRs universally had audio outputs. This presented the simplest, most cost-effective path for implementation, as it required no specialized hardware (like a VBI decoder or a special TV tuner card) in the user's computer. The connection could be made with a simple, off-the-shelf audio cable.
2. Established Technology: The principle of encoding digital data into audible analog tones was the basis for modem technology, which was ubiquitous in the 1990s for internet access over phone lines. A PHOSITA would have been intimately familiar with modulating and demodulating data over an analog audio channel. Applying this known technique to the audio channel of a television broadcast, rather than a phone line, would have been a straightforward and obvious extension of a common practice.

Therefore, combining Wolzien's system for embedding URLs in a broadcast with the common and well-understood method of transmitting data via audio tones would directly result in the invention claimed in US6098106. A PHOSITA would have been motivated to do so to create a cheaper and more accessible version of Wolzien's system.

Secondary Combination: US Patent 5,774,664 (Tinsky) or US 5,778,181 (Hidary) in view of common knowledge

Alternatively, the invention would have been obvious by adapting the systems of Tinsky ('664) or Hidary ('181).

What Tinsky ('664) and Hidary ('181) Teach: Both patents teach the fundamental concept of linking a television broadcast to a specific location on a computer network to provide supplemental information or an interactive experience. Tinsky discloses embedding a reference or address in the broadcast, while Hidary uses a user-selectable on-screen icon that links to a specific online location. Both establish the crucial link between the broadcast and the network resource, as called for in Claim 1.
Motivation to Combine: A PHOSITA looking to improve upon these systems would have been motivated to make the process more seamless and automatic. The Hidary ('181) system required manual user interaction (clicking an icon). An obvious improvement would be to create an automatic trigger that launches the web content without user intervention.
- The motivation would be to enhance the user experience by "pushing" the related web content to the viewer at a precise moment in the broadcast (e.g., during a specific advertisement or scene).
- To create this automatic trigger, a machine-readable signal must be embedded in the broadcast. As explained above, using an audible audio tone was the most direct and economical method available that was compatible with the standard hardware of the era (a TV's audio-out and a PC's audio-in).

By seeking to automate the process taught by Hidary ('181) or to implement the system of Tinsky ('664) using the most common and inexpensive hardware available, a PHOSITA would logically arrive at using an audio signal as the "routing signal," thus rendering the invention of the '106 patent obvious.