Sigray, Inc. v. Carl Zeis X-Ray Microscopy, Inc.—When does “No” Projection Magnification Mean “No”? |

In Sigray, Inc, v. Carl Zeis X-Ray [“Zeiss”], appeal 2023-2211 (Fed. Cir., May 23^, 2025), the panel reviewed the Board’s decision in an IPR in which Claims 1-6 of Zeiss patent no. 7,400,704 were held not to be unpatentable over Jorgensen. Claim 1 of the ‘704 patent reads as follows:

As explained by the panel:

“Projection magnification…utilizes diverging rays that spread out as they travel. The distance between the rays increases after interacting with the sample but before being received by the detector. As a result, the…