Background
Valtrus Innovations Ltd. owns U.S. Patent No. 6,728,704, which claims methods and computer-readable memory for merging search-result lists from multiple search engines. Google LLC petitioned for inter partes review of claims 1–23, arguing that U.S. Patent No. 6,711,569 to Bushee, combined with other references, rendered the challenged claims obvious.
Bushee was filed on July 24, 2001, approximately five weeks before the application that produced the ’704 patent. Valtrus sought to antedate Bushee under the pre-America Invents Act version of 35 U.S.C. § 102(e), relying on an inventor declaration, invention-disclosure documents, Microsoft Word metadata, and expert testimony. The Patent Trial and Appeal Board found that the inventors conceived the claimed invention before Bushee’s filing and exercised reasonably continuous diligence through the ’704 patent application’s filing on August 27, 2001. It therefore concluded that Bushee was not prior art and that Google had not proved any challenged claim unpatentable.
The Court’s Holding
The Federal Circuit affirmed. It held that substantial evidence supported the Board’s finding that Microsoft Word metadata and the disclosure documents corroborated co-inventor Dr. Tsaparas’s testimony concerning conception. Assuming without deciding that the metadata was authentic, the court explained that the automatically generated metadata was not authored by Dr. Tsaparas and could independently corroborate the dates and authorship described in his declaration.
The court also held that substantial evidence supported reasonably continuous diligence throughout the critical period. Google disputed only the period from August 8 to August 27, 2001—about 11 business days—during which the final inventor signature had to travel from Canada to counsel in California and the law firm completed and filed the application. That evidence, together with expert testimony about the time ordinarily required to finalize a patent application, supported the finding that the invention was neither abandoned nor unreasonably delayed.
Key Takeaways
- Automatically generated document metadata may independently corroborate an inventor’s testimony about conception because the metadata is not itself authored by the inventor.
- Reasonably continuous diligence does not require proof of inventive or filing activity on every day of the critical period.
- Because Valtrus antedated Bushee, Bushee was not prior art under pre-AIA § 102(e), defeating all four obviousness grounds presented in the IPR.
Why It Matters
The decision confirms that electronic metadata can play a significant evidentiary role when a patent owner seeks to establish an earlier conception date. Contemporaneous timestamps and authorship data may supply the independent corroboration that inventor testimony and unwitnessed inventor-created documents cannot provide by themselves.
The ruling also applies a practical standard to diligence during patent prosecution. Short periods involving document transmission, attorney review, finalization, and filing may satisfy the reasonably continuous diligence requirement when the record accounts for the period and shows no abandonment or unreasonable delay.