Ascentcare Dental Products, Inc. v. Solmetex, LLC

Ascentcare Dental Products, Inc. filed an Inter Partes Review (IPR) petition against Solmetex, LLC, challenging the validity of U.S. Patent No. 11,589,969 at the Patent Trial and Appeal Board (PTAB). Ascentcare Dental Products, Inc., founded in 2012 and based in Grand Haven, Michigan, is an operating company that designs, engineers, and manufactures innovative dental technologies, including hands-free isolation and suction devices such as the VacuLUX mouthpiece. Solmetex, LLC, established in 1994 and headquartered in Northborough, Massachusetts, is also an operating company that provides dental water safety and waste compliance systems, alongside dental consumables and equipment like amalgam separators, waterline treatment solutions, and modern dental isolation products. The IPR was initiated in the context of an ongoing patent infringement lawsuit, Solmetex LLC v. Ascentcare Dental Products Inc, filed in the U.S. District Court for the Western District of Michigan (Case 1:24-CV-00954), where Solmetex accused Ascentcare's VacuLUX isolation mouthpieces of infringing multiple Solmetex patents.

The patent at issue, U.S. Patent No. 11,589,969, is titled "Dental Isolation Device" and generally relates to dental mouthpieces, particularly those featuring a main body portion configured as a pocket to at least partially enclose an interior space. Ascentcare's petition sought to invalidate claims of this patent, arguing non-infringement of their VacuLUX isolation mouthpieces and questioning the validity of Solmetex's asserted patents over prior art. The case, IPR2025-01020, was filed on July 15, 2025, with the PTAB, a specialized administrative court within the USPTO known for its technical expertise and often more efficient proceedings compared to district court litigation.

However, the IPR was not instituted and was instead terminated on October 9, 2025, due to a "Discretionary Denial" by the PTAB. This procedural denial means the PTAB chose not to initiate a trial on the merits of Ascentcare's invalidity arguments, without assessing the substance of the challenge. The denial occurred around the time of significant policy shifts at the PTAB, including Director John Squires reclaiming personal authority over IPR institution decisions and new guidelines that could lead to discretionary denials based on factors like the likelihood of a parallel district court proceeding reaching a decision first. This outcome is notable as it highlights the increasing use of discretionary denials by the PTAB, which can significantly impact a challenger's ability to contest patent validity outside of district court. Ascentcare also filed other related IPRs against Solmetex, IPR2025-01057 and IPR2025-01104, which also faced discretionary denials.

This analysis covers the key legal developments and outcome for the Inter Partes Review (IPR) proceeding IPR2025-01020, as well as its related patent infringement litigation in district court.

Parallel District Court Litigation: Solmetex, LLC v. Ascentcare Dental Products, Inc. (U.S. District Court, Western District of Michigan, Case No. 1:24-cv-00954)

• Filing & Initial Pleadings: On September 16, 2024, Solmetex, LLC filed a patent infringement lawsuit against Ascentcare Dental Products, Inc. in the U.S. District Court for the Western District of Michigan. Solmetex asserted infringement of ten patents, including U.S. Patent No. 11,589,969. Ascentcare raised various defenses, including invalidity based on lack of written description, anticipation, and obviousness.
• Pre-Trial Motions of Substance: On July 11, 2025, Ascentcare Dental Products, Inc. filed a motion to stay the district court litigation. Ascentcare argued that the Patent Trial and Appeal Board (PTAB) was a more efficient venue to address the validity of Solmetex's patent claims and requested a stay until the PTAB decided whether to institute IPRs, with institution decisions expected between November and mid-December 2025.

Parallel PTAB IPR Proceeding: Ascentcare Dental Products, Inc. v. Solmetex, LLC (IPR2025-01020)

• Filing & Initial Pleadings: Ascentcare Dental Products, Inc. filed an Inter Partes Review petition with the Patent Trial and Appeal Board challenging the validity of U.S. Patent No. 11,589,969. The petition was filed on May 19, 2025. Petitioner's counsel included Nathan Sportel, while Respondent's counsel included Angelo Christopher.
• Outcome: Not Instituted - Procedural (Discretionary Denial): The PTAB issued an institution decision on October 9, 2025, denying institution of IPR2025-01020. The denial was a "Director Discretionary Decision: Deny," indicating a procedural, rather than merits-based, rejection of the petition. This decision occurred during a period (starting around October 2025) where the USPTO Director began reclaiming personal authority over all IPR and Post-Grant Review (PGR) institution decisions, often issuing summary notices without detailed explanations, and increasingly relying on discretionary denial grounds such as "settled expectations" or the presence of related parallel proceedings.

Effect on Litigation

The discretionary denial of institution for IPR2025-01020 means that the PTAB did not review the patentability of U.S. Patent No. 11,589,969. Consequently, Ascentcare's arguments regarding the invalidity of this specific patent will proceed in the district court litigation (Case No. 1:24-cv-00954). The non-institution of this IPR likely weakened Ascentcare's motion to stay the district court case, as one of the primary reasons for the requested stay (PTAB review of the patent's validity) did not materialize for this patent.

Ascentcare Dental Products, Inc., the petitioner in IPR2025-01020, is represented by attorneys from Miller Johnson PLC. The counsel of record in related Inter Partes Review (IPR) proceedings involving the same parties and similar patents include:

• Nathan P. Sportel

  • Role: Lead Counsel, Member in the Intellectual Property practice group.
  • Firm: Miller Johnson PLC, Grand Rapids, Michigan.
  • Relevant Experience: A former U.S. Patent and Trademark Office (USPTO) Patent Examiner, Mr. Sportel is highly experienced in patent prosecution, litigation, and post-grant proceedings, including Inter Partes Reviews (IPRs). He was counsel in the precedential opinion Sotera v. Masimo, which introduced the "Sotera Stipulation" for avoiding Fintiv discretionary denials in IPRs. His litigation experience spans various technologies, including medical technology, wearable devices, and artificial intelligence.

• Brandon C. Griffith

  • Role: Co-Chair and Member of the Intellectual Property practice group.
  • Firm: Miller Johnson PLC, Detroit, Michigan.
  • Relevant Experience: A degreed-mechanical engineer, Mr. Griffith counsels clients on intellectual property strategy, including preparing and prosecuting domestic and foreign patent applications. He has extensive experience with multifaceted patent matters in mechanical, electromechanical, and computer arts, including medical devices, automotive components, and consumer electronics.

• Jacob J. Cowdrey

  • Role: Associate in the Intellectual Property practice group.
  • Firm: Miller Johnson PLC, Grand Rapids, Michigan.
  • Relevant Experience: Mr. Cowdrey focuses on patents in mechanical and electrical technologies. His experience includes preparing and prosecuting patents, conducting freedom-to-operate analyses, and counseling clients on technology transactions.

Counsel of Record for Solmetex, LLC (Defendant/Patent Owner)

In the Inter Partes Review (IPR) case IPR2025-01020, Ascentcare Dental Products, Inc. v. Solmetex, LLC, the defendant, Solmetex, LLC (the Patent Owner), is represented by attorneys from Nixon Peabody LLP.

The counsel of record for Solmetex, LLC includes:

• Angelo Christopher

  • Role: Lead Counsel
  • Firm: Nixon Peabody LLP, Chicago, IL
  • Note: Angelo Christopher is listed as counsel for the Patent Owner, Solmetex, LLC, in IPR2025-01020 and related IPR proceedings.

• Daniel J. Burnham

  • Role: Counsel
  • Firm: Nixon Peabody LLP, Chicago, IL
  • Note: Daniel J. Burnham is listed as counsel for Solmetex, LLC in related IPR proceedings.

• Jennifer Hayes

  • Role: Counsel
  • Firm: Nixon Peabody LLP, Los Angeles, CA
  • Note: Jennifer Hayes is listed as counsel for Solmetex, LLC in related IPR proceedings.