Patent 6604216
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
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Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Proceedings Overview
As of 2026-05-12, there are no AIA trial proceedings (IPR, PGR, or CBM) on file for US patent 6,604,216 at the USPTO's Patent Trial and Appeal Board. For a defendant, this means the patent is untested in this specific administrative forum, and a defensive strategy is not constrained by prior PTAB outcomes or estoppel.
Strategic Summary
The absence of any PTAB challenges against US patent 6,604,216 is a notable data point. Typically, patents that are actively asserted, especially those owned by entities like Optis Wireless Technology which is involved in significant litigation, attract inter partes review petitions from defendants. This patent being un-challenged at the PTAB means all its claims, including independent claims 1, 11, 19, 30, and 34, remain as originally issued and have not been narrowed or invalidated by this administrative body.
For a defendant currently facing an assertion of this patent, the estoppel landscape is entirely open. Since no prior petitioner exists, the defendant and its real-parties-in-interest are free to raise any invalidity ground based on prior art patents or printed publications that they can identify. There is no § 315(e)(2) estoppel from a prior IPR that would limit the arguments available in a new PTAB proceeding or in district court. The lack of prior challenges also means there is no public record of the patent owner defending the claims at the PTAB, which could have provided valuable insights into their defensive strategies and claim construction arguments.
Recommended Next Steps
For a defendant, the primary recommendation is to recognize that US patent 6,604,216 is a clean slate at the PTAB.
- No PTAB Activity Exists: The key takeaway is the absence of any IPR, PGR, or CBM proceedings. This can be confirmed by searching the USPTO's PTAB E2E (now P-TACTS) system.
- Opportunity for a First Challenge: Because the patent is "untested," a defendant has the opportunity to be the first to challenge its validity at the PTAB. A thorough prior art search could uncover grounds for an IPR petition. This path remains a viable and potentially cost-effective defensive lever.
- Review District Court Litigation: While no PTAB cases exist, the patent owner is an active litigant. Reviewing the district court dockets, particularly case 2:17-cv-00123 in the Eastern District of Texas, for invalidity contentions or expert reports filed by other defendants could provide a strong starting point for identifying relevant prior art and building an invalidity case, either for the PTAB or for district court litigation.
Generated 5/12/2026, 12:47:11 AM