IP Law Daily, PATENT—Fed. Cir.: PTAB victory for Sony upheld in dispute over video game image-rendering technology, (Jul 14, 2026)

By Carolin Dennis, B.Sc., LL.B., LL.M.

The Patent Trial and Appeal Board (PTAB) correctly concluded on remand that Intellectual Pixels Limited’s image-rendering and data-compression patent was invalid.

The U.S. Court of Appeals for the Federal Circuit affirmed the PTAB’s decision holding claims of U.S. Patent No. 10,681,109 (’109 patent) unpatentable as obvious because the PTAB did not violate the Federal Circuit’s prior mandate, and its decision was supported by substantial evidence. The Federal Circuit found that the PTAB’s combinations of prior art references supported the obviousness conclusion (Intellectual Pixels Ltd. v. Sony Interactive Entertainment LLC, No. 24-2174 (Fed. Cir. Jul. 10, 2026)).

Intellectual Pixels Limited (IPL) owns the ’109 patent, entitled “Image Display System with Visual Server,” which claims, “an image display system and method of displaying images on a client through the use of the resources of a remote visual server.” Sony Interactive Entertainment, LLC (Sony) petitioned for inter partes review of several claims of the ’109 patent, arguing they were obvious in light of the prior art. The PTAB instituted review and found that the challenged claims were non-obvious because the prior art references did not disclose the “generating” limitation, which required the patented server system to generate a new image based on an original image and modification data submitted by client systems. Sony appealed. The Federal Circuit vacated the finding of non-obviousness and remanded for further proceedings, concluding that substantial evidence did not support the PTAB’s finding that U.S. Patent No. 6,409,602 (Wiltshire) did not disclose generating a new image.

On remand, the PTAB recognized that Wiltshire, by disclosing operating its system in conjunction with a game like Doom, disclosed the external server’s generating new updated images and satisfied the generating limitation of the challenged claims. The PTAB further found that these new updated images were transmitted to the client computers as compressed MPEG streams. Therefore, the PTAB concluded that the compressing limitation was also satisfied and issued a second final written decision holding the challenged claims unpatentable as obvious over Wiltshire in combination with other prior art references. IPL appealed the PTAB’s second final written decision arguing that (1) the PTAB acted contrary to the Federal Circuit’s mandate in the first appeal; and (2) the PTAB’s decision was, in any event, unsupported by substantial evidence.

IPL argued that the PTAB’s second final written decision exceeded the Federal Circuit’s mandate because in its first final written decision the PTAB made two findings not set aside in the Federal Circuit’s opinion but which the PTAB did not adhere to on remand. First, in the first final written decision, the PTAB had concluded that nothing in Wiltshire suggested that a person of ordinary skill in the art would have understood that Wiltshire’s system could possibly have supported Doom in the manner proposed by the petitioner, and second, the PTAB found that Wiltshire’s disclosure is completely silent as to the content or origin of that compressed video MPEG stream.

The Federal Circuit found that the first finding that Wiltshire did not disclose the use of games like Doom was vacated as unsupported by substantial evidence in the Federal Circuit’s prior decision. As stated in the prior opinion, “Wiltshire explicitly discloses that its Figure 2 is to be applied to games like Doom,” which required generating a new image. The PTAB then on remand determined that Wiltshire disclosed “applying its system to video games like Doom, which require ‘generating’ new images.” This remand determination was compelled by the Federal Circuit’s mandate, not foreclosed by it.

As to the PTAB’s second finding, the Federal Circuit noted that the PTAB’s finding in the first decision that “Wiltshire’s disclosure is completely silent as to the content or origin of that ‘compressed video MPEG stream,’” was also implicitly rejected in the first appeal in their discussion of the generating limitation. Both the generating limitation and the compressing limitation disclose an “at least one updated image.” Therefore, the Federal Circuit’s decision determined that Wiltshire was not “silent as to the content or origin of that ‘compressed video MPEG stream.’” In the context of Doom, the content was a newly generated “updated image.” On remand, the PTAB reached the logical conclusion from the Federal Circuit’s reasoning that its finding that Wiltshire is silent as to the content of that compressed MPEG stream was rejected. Thus, neither the PTAB’s first final written decision nor the Federal Circuit’s decision on appeal reached whether the compressing limitation was disclosed in the prior art. Accordingly, any findings as to this issue were not within the scope of the appeal.

IPL alternatively argued that the PTAB’s second final written decision was not supported by substantial evidence. Specifically, IPL argued that Wiltshire does not teach compression of newly generated images into an MPEG stream. The Federal Circuit found this argument unpersuasive. Sony argued in its petition that the compressing limitation was disclosed through a combination of Wiltshire and U.S. Patent No. 6,404,817 (Saha). While Wiltshire generally disclosed transmitting a compressed image to the client device based on the described compressed MPEG stream, Saha provided information on predominant MPEG standards that met the compressing claim limitation that “the server transmits the updated image as a compressed frame that can be decompressed and displayed.” The PTAB agreed, crediting both the text of Wiltshire and Saha as well as expert testimony presented that a skilled artisan would have been familiar with real-time image compression via MPEG compression and would have combined Saha’s standard for compressing and decompressing an MPEG stream with Wiltshire’s system. The Federal Circuit concluded that this was substantial evidence supporting the PTAB’s decision.

Accordingly, the Federal Circuit affirmed the PTAB’s decision.

The Case is No. 24-2174.

Judge: Dyk, T.

Attorneys: Douglas R. Wilson (Armond Wilson LLP) for Intellectual Pixels Ltd. James Murphy Dowd (Wilmer Cutler Pickering Hale and Dorr LLP) for Sony Interactive Entertainment LLC.

Companies: Intellectual Pixels Ltd.; Sony Interactive Entertainment LLC

Cases: Patent TechnologyInternet FedCirNews