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Atty. Evan Harry Langdon

Atty. Evan Harry Langdon

Mr. Evan Harry Langdon is a lawyer practicing international trade, antitrust / trade law, intellectual property and 1 other area of law.

Washington Washington 17 yrs experience 17 year
Call (771) 717-3546 Book Appointment

Profile Summary

About Evan Harry Langdon at a glance

Evan Harry Langdon is an Associate based in Washington, District of Columbia, practicing at Adduci, Mastriani & Schaumberg, L.L.P.. They have 17+ years of legal experience, licensed to practice since 2009. Their practice focuses on patent, ip, and international. Admitted to practice in Virginia U.S. Court of Appeals for the Federal Circuit Registered to practice before the United Stat (2009) and District of Columbia (2012). Educated at The Catholic University of America, Columbus School of Law J.D. magna cum laude The Catholic University of America, Columbus School of Law J.D. Executive Editor The Catholic University of Ame (—) and Villanova University Bachelor of Mechanical Engineering Villanova University cum laude (—). Active member of Memberships •American Bar Association •American Intellectual Property Law Association •ITC Trial Lawyers Association. Serands clients in Washington, DC and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. Evan Harry Langdon is a lawyer practicing international trade, antitrust / trade law, intellectual property and 1 other area of law
  • Evan received a degree from Villanova University, and has been licensed for 17 years
  • Evan practices at Adduci, Mastriani & Schaumberg, L.L.P. in Washington, DC

Practice Areas Explained

Evan Harry Langdon's Areas of Practice

Each practice area below reflects the types of cases Evan Harry Langdon handles, with a brief overview of what that area of law covers.

Patent Law

Evan Harry Langdon is one of 20,749 patent attorneys indexed nationally. Browse patent attorneys in District of Columbia →

Intellectual Property

IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.

Evan Harry Langdon is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in District of Columbia →

International Law

International law attorneys for cross-border transactions, trade, foreign investment, and treaties.

Evan Harry Langdon is one of 40,133 international attorneys indexed nationally. Browse international attorneys in District of Columbia →

Jurisdictional Context

Why local counsel matters in District of Columbia

Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in District of Columbia courts without local counsel or pro hac vice admission.

Looking for additional District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.

Frequently Asked

Common questions about Evan Harry Langdon

Where is Evan Harry Langdon's law office located?
Evan Harry Langdon's law practice is located in Washington, District of Columbia. The firm is Adduci, Mastriani & Schaumberg, L.L.P.. You can contact the office directly through this profile page.
What practice areas does Evan Harry Langdon handle?
Evan Harry Langdon focuses on patent, ip, international. Each practice area listed reflects experience handling cases of that type in District of Columbia.
How long has Evan Harry Langdon practiced law?
Evan Harry Langdon has 17+ years of legal experience and has been licensed since 2009.
Where did Evan Harry Langdon go to law school?
Evan Harry Langdon earned their education at (—); (—).
How can I contact Evan Harry Langdon for a consultation?
You can contact Evan Harry Langdon directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

The Catholic University of America, Columbus School of Law J.D. magna cum laude The Catholic University of America, Columbus School of Law J.D. Executive Editor The Catholic University of Ame
- In Progress
Villanova University Bachelor of Mechanical Engineering Villanova University cum laude
- In Progress

Bar Admissions

Virginia U.S. Court of Appeals for the Federal Circuit Registered to practice before the United Stat
Admitted: 2009
District of Columbia
Admitted: 2012

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