PTAB challenges

The initial search for "PTAB US5768384" did not directly return any PTAB proceedings for this specific patent. However, the search results mention IPR2018-00127 and Unified Patents. The first search result is a "Petitioner's Request for Refund of Post Institution Fees" for IPR2018-00127, but the patent number mentioned in that document is 6,202,150, not 5,768,384. This indicates that IPR2018-00127 is not related to the patent in question.

The other search results discuss Unified Patents generally or their portal, but do not specifically link to any PTAB proceedings for US5768384.

Therefore, based on the provided "PTAB proceedings on file" block and the web search, there are no known PTAB proceedings for US Patent 5,768,384.

Proceedings overview

There are no known AIA trial proceedings on file for US Patent 5,768,384. This means the patent has not been subjected to IPR, PGR, or CBM challenges, and all claims remain untested by the PTAB. This gives a defendant no specific defensive posture based on PTAB invalidations; any defensive strategy would need to focus on prior art or other arguments outside of prior PTAB decisions.

Strategic summary

As of May 23, 2026, there is no public record of any PTAB (Patent Trial and Appeal Board) proceedings challenging US Patent 5,768,384. This implies that all 22 claims of the patent remain untested by the PTAB.

The absence of PTAB activity suggests a few possibilities:

• The patent may not have been widely asserted in litigation, thus not drawing challenges.
• The asserted claims may have been deemed robust against common prior art arguments that would typically succeed in an IPR.
• Potential defendants may have opted for settlement or other strategies instead of pursuing PTAB trials.

Given the patent's expiration in 2010 due to failure to pay maintenance fees, it cannot be asserted for infringement occurring after that date. This significantly limits its current enforceability, which would inherently reduce the motivation for any party to file new PTAB proceedings against it. However, PTAB challenges can sometimes address past infringement claims.

Recommended next steps

If you are a defendant facing assertions of US Patent 5,768,384, it is crucial to note that the patent expired on June 16, 2010, due to non-payment of maintenance fees. Any alleged infringement must have occurred before this date for the patent owner to have a valid claim.

Given the complete absence of PTAB activity, there are no claim-level invalidations or affirmations from the PTAB to leverage defensively. A defense would necessarily involve a comprehensive prior art search and analysis independent of any PTAB record, potentially leading to a de novo invalidity challenge in district court, or leveraging the patent's expired status.

Since the patent is expired, a primary recommendation is to ascertain the dates of alleged infringement. If the alleged infringement occurred after June 16, 2010, the patent can no longer be enforced.