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| (Source: Tosoh) |
Tosoh Corporation has reclaimed full ownership of four pending U.S. patent applications related to fluororesin technologies, following the return of previously shared rights by Nitto Denko Corporation.
In March 2024, Tosoh had partially assigned its rights in the four applications to Nitto Denko. One year later, in March 2025, Nitto Denko relinquished its stake in all four applications, allowing Tosoh to retake sole control of the intellectual property.
The four applications remain ungranted and are focused on enhancing the optical and thermal performance of fluororesin materials. The filings respectively address ultraviolet transmittance improvement, haze suppression for high transparency, and particle-form resins with improved thermal stability.
Such reversals in patent sharing are often seen when joint development projects do not proceed to commercialization, prompting the original assignee to reacquire exclusive rights.
The U.S. patent applications involved are as follows (Source: USPTO):
Patent Application Invention title
None 18394049 FLUORORESIN
None 18406542 FLUORORESIN, AND METHOD FOR PRODUCING SAME
None 18471482 FLUORORESIN, FLUORORESIN PARTICLES, AND METHODS FOR PRODUCING THESE
None 18471794 FLUORORESIN, FLUORORESIN PARTICLES, AND METHODS FOR PRODUCING THESE
By PatenTrip
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