Patent Litigation Counsel for Federal Court Disputes
Keyhani LLC represents patent owners and accused infringers in federal district-court patent disputes — from settlement strategy and trial record development through Federal Circuit preservation. The firm is a litigation-only IP boutique with 20+ years of IP litigation experience and 80+ federal cases as lead counsel.
Federal patent litigation, not general IP advice.
Patent litigation can determine the value of a technology business, product line, licensing position, or defense strategy. Keyhani LLC treats the matter as a federal litigation problem from the first review.
Federal patent litigation, both sides
Representation for patent owners enforcing rights and for businesses responding to infringement allegations, from claim construction through trial and Federal Circuit appeal.
Federal courts nationwide
Federal patent litigation in courts nationwide and for international clients, with a regional focus on New Jersey, New York Metro, and Washington, DC.
Litigation only
Patent disputes and court-focused strategy. Patent prosecution and patent portfolio services are outside the firm's litigation practice.
Patent matters Keyhani LLC handles.
From infringement enforcement to accused-infringer defense, the firm handles federal patent disputes across technologies — from software and electronics to life-science, biochemical, and design patents — through trial and Federal Circuit appeal.
Patent Infringement
Direct, induced, and contributory infringement under 35 U.S.C. § 271 — enforcement demands, complaints, defenses, expert issues, and trial strategy.
View patent infringement
Accused-Infringer Defense
Non-infringement and invalidity defenses; counterclaims and affirmative defenses including unfair competition, tortious interference, laches, estoppel, and antitrust; plus damages exposure, venue challenges, and resolution options.
View infringement defense
Claim Construction
Claim terms, intrinsic evidence, expert testimony, and preservation issues evaluated as trial and appeal questions.
Discuss claim construction
Pharmaceutical Patent
Patent litigation for pharmaceutical and life-science disputes, including Hatch-Waxman, ANDA, and biosimilar conflicts.
Discuss a pharma matter
Damages & Fee Exposure
Reasonable royalty, lost profits, enhanced damages, and exceptional-case fees under 35 U.S.C. § 284 and 35 U.S.C. § 285.
Discuss damages exposure
Federal Circuit Appeals
Appeals of claim construction, dispositive rulings, injunctions, damages, and preserved trial issues, under the Federal Circuit's exclusive jurisdiction over patent appeals (28 U.S.C. § 1295).
View Federal Circuit appeals
Injunctions & Emergency Relief
Preliminary injunction motions and responses, irreparable-harm proof, and the evidentiary record that drives early relief.
Discuss emergency relief
IP Dispute Resolution
Mediation, arbitration, and structured settlement of patent disputes when an open-ended trial is not the best path.
View IP dispute resolutionEarly decisions shape patent case value.
The initial response, forum, claim chart, expert roadmap, and damages theory can set the direction for the rest of a patent dispute.
Claim scope
Claim language, specification support, prosecution history, prior art, product documents, and technical testimony determine whether the dispute is strong, narrow, or overextended.
Forum and timetable
Venue, local patent rules, case-management orders, judge-specific practices, and related proceedings affect deadlines and settlement timing.
Damages theory
Reasonable royalty, lost profits, apportionment, willfulness, and fee exposure require early evidentiary discipline.
Appeal preservation
Federal Circuit review can turn on claim construction, expert exclusions, jury instructions, damages proof, injunction rulings, and preserved objections.
Patent litigation led by senior trial counsel.
Patent matters are handled by founder and lead counsel Darius Keyhani, on both the patent-owner and accused-infringer sides.
Darius Keyhani
Darius Keyhani has more than 20 years of intellectual property litigation experience and has served as lead counsel in 80+ federal cases. He is admitted to the U.S. Court of Appeals for the Federal Circuit and the U.S. Supreme Court bar, and holds an LL.M. from NYU School of Law.
His patent practice spans infringement enforcement and defense, claim construction, damages, injunctions, and Federal Circuit appeals — from the complaint through trial and appeal.
Questions before contacting the firm.
Short answers for scope, court coverage, and how to begin a case evaluation.
Can Keyhani LLC represent either side of a patent dispute?
Yes. The firm represents patent owners enforcing rights and businesses responding to infringement claims, demand letters, complaints, injunction threats, and damages allegations.
Does Keyhani LLC handle patent prosecution?
No. Keyhani LLC is a litigation boutique. Patent prosecution and patent portfolio services are outside the firm's litigation practice; the firm handles patent disputes, enforcement, defense, district-court litigation, and Federal Circuit preservation.
Does Keyhani LLC handle PTAB, IPR, or ITC proceedings?
The firm focuses on federal district-court patent litigation and Federal Circuit appeals. PTAB, IPR, and ITC proceedings are addressed where they affect a district-court dispute — not offered as standalone services.
What courts does the firm serve for patent litigation?
Keyhani LLC represents clients in federal courts nationwide and serves international clients, working from its Washington, DC office with a primary regional focus on New Jersey and the New York metro area. Where a matter is in another court, the firm appears pro hac vice with local counsel as required.
Discuss your patent litigation matter.
If your business is enforcing patent rights or responding to a patent infringement claim, contact Keyhani LLC to discuss the forum, evidence, claim scope, damages exposure, and litigation strategy.