This is an opinion from the United States Court of Appeals for the Federal Circuit regarding a patent dispute between Sigray, Inc. and Carl Zeiss X-Ray Microscopy, Inc. The case involves U.S. Patent No. 7,400,704, owned by Zeiss, which covers X-ray imaging systems with projection magnification. Sigray challenged the patent's validity through an inter partes review at the Patent Trial and Appeal Board (PTAB), arguing certain claims were anticipated or rendered obvious by prior art, specifically a reference called Jorgensen. The Court of Appeals reversed the PTAB's decision concerning claims 1, 3, and 4, finding they were indeed anticipated by Jorgensen due to the inherent presence of projection magnification, even at very small levels. The court determined the PTAB incorrectly construed the claim limitation regarding the range of projection magnification. The case is remanded for the PTAB to consider the obviousness of the remaining claims (2, 5, and 6) in light of the court's ruling.

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