Atty. Don H. Marmaduke

Atty. Don H. Marmaduke

Don H. Marmaduke is a lawyer practicing appeals, intellectual property litigation, antitrust litigation and 4 other areas of law.

Portland Portland 75 yrs experience 75 year
Call (971) 228-2852 Book Appointment

Profile Summary

About Don H. Marmaduke at a glance

Don H. Marmaduke is a Co-Founder based in Portland, Oregon, practicing at Tonkon Torp LLP. They have 75+ years of legal experience, licensed to practice since 1951. Their practice focuses on business, ip, litigation, civil rights, and insurance. Admitted to practice in Massachusetts (1951). Educated at Harvard Law School (LL.B., 1951) and Yale University (B.E., 1946). Recognitions include AV Preeminent. Serands clients in Portland, OR and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Don H. Marmaduke is a lawyer practicing appeals, intellectual property litigation, antitrust litigation and 4 other areas of law
  • Don received a B.E. degree from Yale University in 1946, and has been licensed for 75 years
  • Don practices at Tonkon Torp LLP in Portland, OR

Practice Areas Explained

Don H. Marmaduke's Areas of Practice

Each practice area below reflects the types of cases Don H. Marmaduke handles, with a brief overview of what that area of law covers.

Business & Corporate Law

Business attorneys advise founders and growing companies on entity formation, contracts, financing, M&A, and dispute resolution.

Don H. Marmaduke is one of 501,317 business attorneys indexed nationally. Browse business attorneys in Oregon →

Intellectual Property

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

Don H. Marmaduke is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in Oregon →

Civil Litigation

Civil litigation attorneys for breach of contract, business disputes, civil rights, and class action lawsuits.

Don H. Marmaduke is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Oregon →

Civil Rights

Civil rights attorneys for discrimination, police misconduct, constitutional rights, and civil liberties cases.

Don H. Marmaduke is one of 70,245 civil rights attorneys indexed nationally. Browse civil rights attorneys in Oregon →

Insurance Law

Insurance attorneys for coverage disputes, bad faith claims, denied claims, and policy disputes.

Don H. Marmaduke is one of 121,912 insurance attorneys indexed nationally. Browse insurance attorneys in Oregon →

Jurisdictional Context

Why local counsel matters in Oregon

Practicing law in Oregon. Legal matters in Oregon are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Portland are typically filed in the local municipal court or the appropriate Oregon state district court, depending on subject matter and amount in controversy. An attorney licensed in Oregon 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 Oregon courts without local counsel or pro hac vice admission.

Looking for additional Oregon attorneys? Browse all attorneys in Portland or all attorneys in Oregon.

Frequently Asked

Common questions about Don H. Marmaduke

Where is Don H. Marmaduke's law office located?
Don H. Marmaduke's law practice is located in Portland, Oregon. The firm is Tonkon Torp LLP. You can contact the office directly through this profile page.
What practice areas does Don H. Marmaduke handle?
Don H. Marmaduke focuses on business, ip, litigation, civil rights, insurance. Each practice area listed reflects experience handling cases of that type in Oregon.
How long has Don H. Marmaduke practiced law?
Don H. Marmaduke has 75+ years of legal experience and has been licensed since 1951.
Where did Don H. Marmaduke go to law school?
Don H. Marmaduke earned their education at (LL.B., 1951); (B.E., 1946).
How can I contact Don H. Marmaduke for a consultation?
You can contact Don H. Marmaduke 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.
What awards or recognition has Don H. Marmaduke received?
Don H. Marmaduke's notable recognition includes: AV Preeminent.

Education

LL.B.
Harvard Law School
- 1951
B.E.
Yale University
- 1946

Awards

AV Preeminent

Bar Admissions

Massachusetts
Admitted: 1951

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