Aaron Olejniczak

Ranked in United States: Wisconsin
IAM Research

The Patent 1000 focuses exclusively on patent practice and has firmly established itself as the definitive 'go-to' resource for those seeking world-class legal patent expertise.

Recommended - Individuals: litigation

“Andrus IP is simply the best and a pleasure to work with. The firm offers a broad scope of expertise and capabilities, and its professionals are effective and efficient in getting patents to proceed to grant.” Andrus, an IP Boutique, punches above its weight, providing a diverse portfolio of international corporations with quality, cost-effective service. “There is no one like [Peter Holsen] when it comes to service-mindedness, responsiveness, knowledge, and legal and technical capabilities. He can understand any invention, no matter how complicated, and apply it in a legal setting.” Talented litigator Aaron Olejniczak is “prompt, knowledgeable and able to communicate sophisticated issues”, while Chris Liro litigates across the IP spectrum with poise and is quick to get to grips with the technology at hand. Ryann Beck earns praise for being “knowledgeable and detail oriented”, and Emily Chilson for her “precise, service-minded approach; she is a pleasure to work with”. Joseph Kuborn is another discerning choice for high-level strategic prosecution work; he provides clients with concrete, honest and commercially sound advice. As does Benjamin Imhoff, who has a keen eye for spotting opportunities and avoiding disputes. Edward Williams stands out as a deep thinker and creative problem solver, who views issues from a unique perspective in order to devise long-term solutions.

Aaron Olejniczak's Profile

Aaron Olejniczak handles a wide variety of intellectual property disputes, concentrating on patent, trademark, and copyright litigation at both the district and appellate court levels, post-grant patent challenges such as inter partes review and ex parte reexamination before the US PTAB, and trademark opposition and cancellation proceedings before the Trademark Trial and Appeal Board. Aaron is also experienced in alternative dispute resolution, including mediation and arbitration. Moreover, Aaron maintains an active portfolio management practice, routinely advising client on protecting their intellectual property rights.

Aaron has significant litigation experience, including serving as lead counsel in patent jury trials, arguing appellate cases before the US Court of Appeals for the Federal Circuit, and as lead counsel in inter partes review proceedings. The Andrus litigation team has been successful in securing injunctions, damages judgments of seven and eight figures, institution of inter partes reviews, and in maintaining the valid claims for patent owners after reviews are instituted. Aaron has also served as lead counsel in patent and trademark litigation cases where the team obtained preliminary injunctions against the opposing party. Aaron has served clients in many other patent, trademark and copyright infringement suits both in Wisconsin and throughout the United States.

In addition, Aaron has an active local counsel practice in the Eastern and Western Districts of Wisconsin, where he partners with lead counsel and leverages his expertise in the local courts to provide well-rounded, yet cost-effective, representation for the client.

In addition to his litigation practice, Aaron serves clients in US and international patent prosecution and counsels clients on all patent, trademark and copyright concerns. Aaron provides infringement, novelty and right-to-use opinions in a wide variety of technology areas.

Aaron received a bachelor of science degree in pre-professional studies in science and business, focusing on biology and accounting, from the University of Notre Dame. He received his juris doctor degree from the University of Wisconsin Law School.


Firm Profile

Andrus is a full-service IP law firm. We assist our clients in all phases of IP acquisition and management – counselling clients on IP strategy, procuring IP assets, managing the prosecution and maintenance of global IP portfolios, representing clients in enforcement and litigation actions regarding their IP assets, and assisting clients in IP transactional matters.

Our attorneys have a diverse range of technical backgrounds in the fields of biology, biomedical engineering, chemistry, civil engineering, computer software and hardware, electrical engineering, electronics, fluid dynamics, mechanical engineering, medical devices, metallurgical engineering and physics. This well-rounded technical expertise allows us to serve clients in a variety of industries.

Established in 1939, Andrus is the longest-operating law firm in the state of Wisconsin devoted exclusively to the practice of IP law. This longevity evidences our ability to adapt to complex and rapidly changing business and technical environments. Our mission is to continue providing clients with experienced IP counsel regarding procurement, management and protection of IP rights.


The patent practice group at Andrus provides a diverse range of procurement and portfolio management services, including protection of utility, design and provisional patents.

Our attorneys work with clients to recognise protectable rights, draft applications, develop filing strategies, prosecute patent applications, and commercialise, protect and enforce patents. Members of Andrus's patent practice group also have extensive experience in administrative appeals, interferences, derivation proceedings, petitions, protests, reissues, re-examinations and inter partes reviews. Our attorneys can also counsel clients on protecting proprietary information as trade secrets and through non-disclosure agreements.

IP litigation

The IP litigation team at Andrus uses its experience to comprehensively address all phases of litigation, including counselling, trial, discovery, Markman hearings, pre-trial proceedings, mediation and appeals. The attorneys on Andrus’ IP litigation team have technical training and experience and are registered with the US Patent and Trademark Office (USPTO). More importantly, our litigation attorneys have considerable hands-on courtroom experience, including significant jury trial experience. This unique blend of technical skill and courtroom experience yields proven, cost-effective results.

Andrus's IP litigation team provides services to businesses of all sizes domestically and throughout the world. Additionally, our familiarity with the judges, procedures and requirements in the US District Courts for both the Eastern and Western Districts of Wisconsin makes Andrus an ideal choice for lead counsel, local counsel or co-counsel in IP disputes venued in Wisconsin.

The attorneys on Andrus's IP litigation team are engaged in federal courts across the country pursuing and defending claims of patent infringement, trademark infringement, copyright infringement, unfair competition, trade secret violations, licensing disputes and related IP contract disputes. A core competency of our litigation team is trying complex cases to judges and juries. We are skilled at courtroom presentation, using the appropriate mix of witness preparation, demonstrations, exhibits, video, computer animation and other courtroom technology to distil complex factual and legal matters. Our team also represents clients in alternative dispute resolution of litigations and other disputes, including mediations and arbitrations.

Our team also litigates matters at the USPTO, including inter partes reviews, trademark oppositions and cancellation proceedings, and patent and trademark appeals. If appeal is necessary, our litigation team has a wealth of experience before the Court of Appeals for the Federal Circuit and the Court of Appeals for the Seventh Circuit.

IP transactions

The IP attorneys in the IP transactions group at Andrus have both an in-depth understanding of IP issues, and the drafting and negotiation expertise to capitalise on that knowledge in complex commercial transactions involving all types of intellectual property. The attorneys practising in this area – all of whom are registered patent attorneys – have drafted and negotiated numerous technology-related commercial agreements, both in private practice and in-house counsel roles.


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