A related patent application (US20190291039A1) naming Jeri Ellsworth as inventor was published on September 24, 2019, detailing fiducial marker synchronization for mixed-reality tracking.
Also on September 24, 2019, the related U.S. patent application "System and method for synchronizing fiducial markers" (US20190291039A1), naming Jeri Ellsworth as inventor, was published.
This publication built upon her original 2004 fiducial marker synchronization patent, refining the technical disclosure for synchronization methods essential to accurate spatial tracking in mixed-reality systems. Fiducial markers remain a core technology in consumer AR products, including Ellsworth's own Tilt Five tabletop AR gaming system, which relies on precise tracking of glasses and game boards relative to one another.
The 2019 publication date situates this filing squarely within the period of Tilt Five's product development and public unveiling, suggesting the patent protects specific technical innovations incorporated into that commercial product.
Taken together with the companion object-tracking publication from the same day, this filing demonstrates Ellsworth's sustained, decades-long technical leadership in AR/VR spatial computing. It also illustrates a broader industry pattern in which foundational patents filed in the mid-2000s — ahead of consumer market readiness — were revisited, refined, and republished as the underlying technology matured into shipping products, cementing her role as a long-term innovator in the field rather than a one-time contributor.