How an LG Product Lead Uncovered Voice-Control Prior Art for High-Stakes Litigation

Value Delivered

The research identified a pre-cutoff patent disclosing the critical voice-input timeout and reactivation mechanism that had remained missing from nearly 2,000 reviewed patent and non-patent references.

The client could use this evidence to strengthen its invalidity position in litigation by demonstrating that the claimed handling of single and multiple voice-search results—including reactivating voice input for another preset duration—had already been explored before the relevant date.

Problem Solved

The target claim covered a voice-controlled system that detects the completion of a voice input received within a predetermined period. Its key distinction concerned how the system responded to search results:

• When only one result was obtained, the device exited voice-input mode and displayed that result.
• When multiple results were obtained, the system reset or reactivated voice-input mode, allowing the user to provide another voice command and select from the available results.

Although extensive literature discussed voice recognition, displaying search results, and selecting among multiple options, the specific feature of resetting the predetermined voice-input period was difficult to locate. Even after reviewing approximately 2,000 sources, no reference clearly disclosed the complete functionality.

Solution Offered

A search without date restrictions revealed that several major technology companies had implemented voice control in smart televisions and remote controls. This led to a blog reporting that LG had introduced voice-control functionality in its Magic Remote before the cutoff date.

The LG Magic Remote became a key lead, but archived LG webpages, product manuals, and launch videos did not explain whether or how the voice-input period was reset when multiple results appeared.

The strategy was therefore shifted from product documentation to LG’s patent portfolio. The search terminology was also refined using focused concepts such as:

• “Preset duration”;
• “Voice reactivation”; and
• “Timeout.”

This targeted approach identified US20090105364A1, which disclosed activating voice recognition for a predetermined period and, when multiple results were received, reactivating voice input for another preset period. The reference supplied the missing technical disclosure and provided the client with focused prior-art evidence for use in the litigation.

Get the full case study to discover how an LG product lead uncovered voice-control prior art for high-stakes patent litigation.