PTAB challenges

Proceedings Overview

No AIA trial proceedings have been filed at the PTAB for U.S. Patent No. 6,073,142; however, this absence is due to the patent's asserted claims being decisively invalidated in Federal court, which provides a defendant with an absolute defense against infringement allegations.

No PTAB Proceedings on File

A comprehensive search of the USPTO's PTAB dockets and other public records confirms that no Inter Partes Review (IPR), Post-Grant Review (PGR), or Covered Business Method (CBM) proceedings have ever been initiated against U.S. Patent No. 6,073,142. The patent expired in 2017, and its claims were invalidated by the judiciary before then, making any potential PTAB challenges moot.

Strategic Summary

For a defendant facing an assertion of this patent, the strategic landscape is not defined by PTAB activity but by the superseding outcome of Federal court litigation.

• Claim Status: INVALIDATED: While no claims have been CANCELED by the PTAB, the asserted claims of the '142 patent were held to be patent-ineligible under 35 U.S.C. § 101 by the U.S. Court of Appeals for the Federal Circuit. This judicial invalidation is legally dispositive and renders the patent unenforceable. The Federal Circuit concluded that the patent claimed the abstract idea of filtering messages using generic computer functions, which is not eligible for patent protection.

• Estoppel Landscape: As no IPRs were ever filed, there is no IPR-related estoppel under 35 U.S.C. § 315(e) for any party. This is a moot point, as the judicial invalidation of the patent provides a complete defense that does not rely on prior art.

• Pattern Signals: The litigation history shows that this patent was part of a large-scale assertion campaign by Intellectual Ventures I LLC, a prominent non-practicing entity. The successful invalidation of the patent in the Symantec case was a significant event, representative of a broader trend of software patents from that era being found ineligible under the Alice/Mayo framework. The lack of PTAB challenges is a direct result of this successful court battle; once the patent was invalidated on § 101 grounds, there was no need for defendants to pursue separate, prior-art-based challenges at the PTAB.

Recommended Next Steps

A defendant receiving a demand letter or facing a complaint citing U.S. Patent No. 6,073,142 has a definitive, case-ending defense.

• Cite the Controlling Precedent: The primary and only necessary response is to cite the Federal Circuit's decision in Intellectual Ventures I LLC v. Symantec Corp., 838 F.3d 1307 (Fed. Cir. 2016). This decision is binding precedent that invalidates the patent's claims.

• Quote the Federal Circuit's Holding: A response should quote the court's conclusion directly. The Federal Circuit affirmed the district court's finding of ineligibility, stating that "each step does no more than require a generic computer to perform generic computer functions.” The court found the patent was directed to an abstract idea and that the claims, viewed individually and as an ordered combination, did not add an "inventive concept" sufficient to transform the abstract idea into a patent-eligible invention.

The continued assertion of a patent that has been judicially invalidated by the Federal Circuit is improper. A defendant should point to this dispositive ruling to demand an immediate withdrawal of any infringement allegations.