Patent Litigation & Appeals
Experienced counsel for complex patent disputes—from early strategy through appeal
Divergent Patent Law is AddyHart LLC’s dedicated patent prosecution practice. When a patent matter develops into litigation or requires appellate representation, clients can draw on the broader AddyHart team’s experience in U.S. district courts, proceedings before the Patent Trial and Appeal Board, and appeals before the U.S. Court of Appeals for the Federal Circuit.
Patent prosecution and litigation are closely connected. The claims, specification, and prosecution history developed before the U.S. Patent and Trademark Office may later shape questions involving claim construction, validity, infringement, and enforcement. AddyHart brings together attorneys with technical backgrounds and experience across patent prosecution, post-grant proceedings, litigation and appeals.
Patent Disputes Across Forums
District-Court Patent Litigation
AddyHart represents patent owners, accused infringers, and other interested parties in infringement, declaratory-judgment, and related patent disputes. The team handles matters from pre-suit assessment and claim construction through discovery, expert proceedings, trial, and post-trial motions.
Federal Circuit Appeals
AddyHart represents clients in patent appeals involving district-court judgments, PTAB decisions, claim construction, validity, infringement, damages, and other issues affecting valuable patent rights.
PTAB & Post-Grant Proceedings
We represent patent owners and challengers in post-grant proceedings before the Patent Trial and Appeal Board, including inter partes review and ex parte reexamination matters. These proceedings often require close coordination among prosecution strategy, claim construction, prior art analysis, and parallel litigation.
Litigation Informed by Technology & Prosecution
Patent litigation often turns on decisions made years before a dispute begins. Claim language, specification support, prosecution arguments, continuation strategy, and the technical operation of the accused product can shape issues involving claim construction, infringement, validity, damages, and enforcement.
AddyHart brings together litigators, patent prosecutors, post-grant counsel, and attorneys with technical backgrounds. This integrated perspective helps the team identify the issues that matter, communicate effectively with inventors and experts, and maintain coordinated positions before the USPTO, the PTAB, and the courts.
Why AddyHart for
Patent Litigation
Integrated Patent Experience
AddyHart’s litigation strategy is informed by experience in patent prosecution, post-grant proceedings, licensing, and appeals. The team evaluates not only the immediate dispute but also the potential effects on related patents, pending applications, and future enforcement opportunities.
Technical Depth
The firm’s attorneys work across software, artificial intelligence, semiconductors, electrical systems, automotive technology, medical devices, pharmaceuticals, biotechnology, and advanced manufacturing. Technical experience allows the team to engage directly with complex evidence and develop clear explanations for courts, experts, and decision-makers.
Focused Teams & Senior Attention
AddyHart uses focused teams led by experienced attorneys who remain directly involved in strategy, analysis, client communication, and advocacy. Staffing, budgets, decision-making responsibilities, and reporting expectations are established early and adjusted to the value and complexity of the dispute.
Continuity From Dispute Through Appeal
Positions developed during claim construction, expert discovery, dispositive motions, trial, and PTAB proceedings can shape the appellate record. AddyHart approaches each stage with potential post-trial and Federal Circuit review in mind.
Representative technologies: Software and artificial intelligence · Semiconductors and electronics · Automotive and industrial systems · Medical devices · Pharmaceuticals and biotechnology · Consumer and manufacturing technologies
Relevant Team
The professionals below combine IPR, reexamination, appellate, litigation, prosecution, and technical experience relevant to challenges involving issued patents.
Meredith Martin Addy
President & Co-Founder · Registered Patent Attorney · Electrical Engineer
An electrical engineer and registered patent attorney, Mimi draws on more than 100 district-court patent cases and more than 100 Federal Circuit appeals to advise on prosecution strategy, PTAB proceedings, licensing, and portfolio durability.
Gregory B. Gulliver
Partner · Registered Patent Attorney · Former Software Engineer
A former software engineer with nine years of industry experience, Gregory has prepared and prosecuted hundreds of applications involving wireless communications, software, computer hardware, semiconductors, and network technologies.
Brandon R. Theiss
Partner · Registered Patent Attorney · Licensed Professional Engineer
A licensed professional engineer and former industrial-control and medical-device engineer, Brandon advises on patent prosecution, § 101 strategy, portfolio development, and post-grant proceedings involving AI, software, cloud systems, medical devices, and automation.
Craig McLaughlin
Senior Counsel · Registered Patent Attorney · Biology Background
A registered patent attorney with a biology background and nearly 30 years of experience, Craig handles utility and design-patent matters involving medical devices, mechanical systems, consumer products, computer hardware, and related post-grant and appellate issues.
Get In Touch
Whether you are responding to a complaint, demand letter, threatened lawsuit, PTAB filing, or approaching appellate deadline, early assessment can preserve important legal and strategic options.
Please do not include confidential information in an initial inquiry. An attorney-client relationship is formed only through a written engagement agreement.