Atty. William C Cahill

Atty. William C Cahill

Mr. William C Cahill is a lawyer practicing trademark and copyright law, computer software, intellectual property and 4 other areas of law.

Phoenix Phoenix 65 yrs experience 65 year
Call (602) 899-8631 Book Appointment

Profile Summary

About William C Cahill at a glance

William C Cahill is a Member based in Phoenix, Arizona, practicing at Cahill Glazer Plc. They have 65+ years of legal experience, licensed to practice since 1961. Their practice focuses on trademark, copyright, ip, trade secrets, and litigation. Admitted to practice in Arizona (1961), U.S. District Court of Arizona (1963), U.S. Court of Appeals, Fifth Circuit (1967), and U.S. Court of Appeals, Ninth Circuit (1967). Educated at George Washington University (J.D., 1960) and University of Akron (B.E.E. University, 1955). Recognitions include AV Preeminent. Active member of The District of Columbia Bar American Bar Association State Bar of Arizona American Intellectual Property Law Association Institute of Electrical and Electronic Engineers United States Trademark Association. Serands clients in Phoenix, AZ and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Mr. William C Cahill is a lawyer practicing trademark and copyright law, computer software, intellectual property and 4 other areas of law
  • William received a B.E.E. degree from University of Akron in 1955, and has been licensed for 65 years
  • William practices at Cahill Law Firm LLC in Phoenix, AZ

Practice Areas Explained

William C Cahill's Areas of Practice

Each practice area below reflects the types of cases William C Cahill handles, with a brief overview of what that area of law covers.

Trademark Law

William C Cahill is one of 23,222 trademark attorneys indexed nationally. Browse trademark attorneys in Arizona →

Copyright Law

William C Cahill is one of 17,495 copyright attorneys indexed nationally. Browse copyright attorneys in Arizona →

Intellectual Property

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

William C Cahill is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in Arizona →

Trade Secrets

William C Cahill is one of 6,644 trade secrets attorneys indexed nationally. Browse trade secrets attorneys in Arizona →

Civil Litigation

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

William C Cahill is one of 454,532 litigation attorneys indexed nationally. Browse litigation attorneys in Arizona →

Jurisdictional Context

Why local counsel matters in Arizona

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

Looking for additional Arizona attorneys? Browse all attorneys in Phoenix or all attorneys in Arizona.

Frequently Asked

Common questions about William C Cahill

Where is William C Cahill's law office located?
William C Cahill's law practice is located in Phoenix, Arizona. The firm is Cahill Glazer Plc. You can contact the office directly through this profile page.
What practice areas does William C Cahill handle?
William C Cahill focuses on trademark, copyright, ip, trade secrets, litigation. Each practice area listed reflects experience handling cases of that type in Arizona.
How long has William C Cahill practiced law?
William C Cahill has 65+ years of legal experience and has been licensed since 1961.
Where did William C Cahill go to law school?
William C Cahill earned their education at (J.D., 1960); (B.E.E. University, 1955).
How can I contact William C Cahill for a consultation?
You can contact William C Cahill 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 William C Cahill received?
William C Cahill's notable recognition includes: AV Preeminent.

Education

J.D.
George Washington University
- 1960
B.E.E. University
University of Akron
- 1955

Awards

AV Preeminent

Bar Admissions

Arizona
Admitted: 1961
U.S. District Court of Arizona
Admitted: 1963
U.S. Court of Appeals, Fifth Circuit
Admitted: 1967
U.S. Court of Appeals, Ninth Circuit
Admitted: 1967
U.S. Supreme Court
Admitted: 1968
District of Columbia
Admitted: 1978
U.S. Court of Appeals for the Federal Circuit registered to practice before U.S. Patent and Trademar
Admitted: 1982

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