The United States Patent and Trademark Office (USPTO) has officially registered trademark number 74132257. This registration pertains to a specific type of temperature sensor designed to indicate ambient freezing temperatures on driving surfaces by changing color. The abstract describes the invention as a device for signaling whether a stretch of the driving surface is frozen or not.

This registration signifies the USPTO's recognition of the trademark for this particular invention. While this is a trademark registration and not a regulatory rule, manufacturers or entities involved in the production or sale of such temperature sensors should be aware of this registered intellectual property. The filing date was January 22, 1991, and the registration became effective on March 26, 2026.