Background
SpaceTime3D owns U.S. Patent No. 8,881,048, which concerns a graphical user interface that displays images corresponding to webpages as objects in a simulated three-dimensional space and, after a user selects an object, displays the corresponding webpage in a two-dimensional space. Apple and Google petitioned for inter partes review, contending that claims 1-18 were obvious based on combinations involving Robertson, Gettman, and Gralla, or Sauve and Tsuda.
The Patent Trial and Appeal Board found that Apple had not proved claims 1-13 unpatentable but had proved claims 14-18 unpatentable. The distinction turned principally on claim language: claim 1 requires the two-dimensional window to include “the rendered first webpage,” while claim 14 requires only “the first webpage.” Apple appealed the ruling on claims 1-13, and SpaceTime3D cross-appealed the ruling on claims 14-18.
The Court’s Holding
The Federal Circuit affirmed the Board in all respects. It upheld the construction of “the rendered first webpage” in claim 1 as the rendered version from which the corresponding image was captured. Substantial evidence supported the Board’s finding that the asserted prior art did not establish display of that previously rendered version. The court also held that the Board did not abuse its discretion by excluding Apple’s reply-stage browser-caching theory and new supporting prior art because they supplied a missing teaching not presented in the petitions. The Board likewise did not impose an improper express-disclosure requirement when evaluating the Sauve-Tsuda ground.
On SpaceTime3D’s cross-appeal, the court upheld the broader construction of “the first webpage” in claim 14 because that claim does not require the same previously rendered version specified in claim 1. Substantial evidence also supported the Board’s findings that Robertson and Gettman disclose a window within a two-dimensional space and that Tsuda’s horizontally stacked windows disclose the claimed foreground-and-background relationship. Claims 1-13 therefore remained patentable over the asserted grounds, while claims 14-18 remained unpatentable.
Key Takeaways
- The definite article and antecedent structure of “the rendered first webpage” tied claim 1 to the previously rendered webpage used to generate the corresponding image.
- An IPR petitioner may respond to a post-institution claim construction, but it may not use its reply to introduce new prior art supplying a claim limitation missing from the petition.
- Claim 14’s omission of the word “rendered” supported a broader construction and materially changed the obviousness result.
Why It Matters
The nonprecedential decision illustrates how small differences between related patent claims can control validity outcomes. It also underscores the importance of presenting a complete unpatentability theory in an IPR petition rather than relying on reply-stage evidence to fill a substantive gap.
The ruling leaves the ’048 patent divided: claims 1-13 survived the asserted obviousness challenges, while claims 14-18 did not. Each party was ordered to bear its own costs.