CONTACT USarrow icon

"*" indicates required fields



Protecting your innovations

Patents allow businesses to safeguard their innovations. But when patent disputes arise, they can be substantively and legally complicated and may involve multiple tribunals. Patent holders who must enforce their patents in federal district courts are increasingly required to overcome invalidity challenges before the Patent Trial Appeal Board (PTAB), which is part of the U.S. Patent and Trademark Office.

PTAB challenges can involve inter-partes review, post-grant review, or covered business method review. Petitioners bring PTAB challenges because they can be an efficient way to defeat patent claims earlier in the process than traditional litigation. Therefore, experienced patent litigation counsel must handle these disputes.

Dunlap Bennett & Ludwig has extensive experience representing patent holders in federal district court, PTAB proceedings, federal appellate courts, and International Trade Commission proceedings. We were voted one of the Top 100 Intellectual Property Law Firms in the United States by IP Watchdog in 2019.

Our experience in patent litigation

Dunlap Bennett & Ludwig has significant experience litigating and resolving patent disputes in a variety of industries. Our law firm acted as lead amicus counsel in the recent TC Heartland decision, won three preliminary injunctions in federal patent cases over the last few years, and prevailed in a federal appeal where the PTAB had ruled against the underlying patent. We also have a winning record when it comes to federal appeals.

Our law firm has successfully handled patent disputes by staffing federal district court and PTAB proceedings with overlapping attorneys. This saves time, improves efficiency, and creates a team that can take on new developments in the case as a unified front.

All of our patent litigators are registered patent attorneys and have a deep understanding of patent law and procedure. They have engineering backgrounds and can understand complex technology, cross-examine technical experts, and turn complicated information into stories that engage federal district court and PTAB judges.

What we do

  • Examine intellectual property cases with detailed and professional analysis
  • Help patent holders bring and resolve patent infringement claims
  • Represent patent holders in patent disputes before federal district courts, the PTAB, federal circuit courts, and the International Trade Commission
  • Seek temporary restraining orders, preliminary injunctive relief, and permanent injunctive relief to halt patent infringement and preserve clients’ market shares
  • Re-evaluate the risks and benefits of settlement and trial throughout the course of litigation



Charles Cantine


Joseph (Joe) Diamante


Thomas Dunlap


William Flachsbart


Robert Greenspoon


David Ludwig


Cortland Putbrese



Mark Magas

Senior Associate

Frederick (Erick) Poorbaugh

Senior Associate


"*" indicates required fields

Please do not include any confidential or sensitive information in this form.
Submitting this form does not create an attorney-client relationship.
This field is for validation purposes and should be left unchanged.

Intern Program

As part of our effort to recruit, develop and retail the best and brightest attorneys, Dunlap Bennett & Ludwig offers a summer intern program for promising law school students who are looking to work as part of an innovative and incredibly successful team. With a global team of lawyers, selected candidates are able to work on high level projects in a collaborative space.

Paralegals and Legal Support Staff

At Dunlap Bennett & Ludwig, our team of paralegals and staff work together collaboratively along side our attorneys toward a common goal. We have created a positive work environment where our paralegals and legal assistants work to successfully reach firm-wide goals and support each other to combine individual strengths to enhance team performance. They regularly assist our attorneys with organizing and maintaining files, conducting legal research, and preparing documents.