Atty. William Joseph Castillo

Atty. William Joseph Castillo

William Joseph Castillo is a lawyer practicing intellectual property. William Joseph received a M.A. degree from New York University in 1993, and has been licensed for 29 years.

Philadelphia Philadelphia 29 yrs experience 29 year
Call (267) 925-3596 Book Appointment

Profile Summary

About William Joseph Castillo at a glance

William Joseph Castillo is a ip attorney based in Philadelphia, Pennsylvania. They have 29+ years of legal experience, licensed to practice since 1997. Admitted to practice in New York (1997), New Jersey (1997), U.S. District Court, District of New Jersey (1997), and Pennsylvania (2004). Educated at Temple University (J.D., 1996) and New York University (M.A. Temple, 1993). Serands clients in Philadelphia, PA and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • William Joseph Castillo is a lawyer practicing intellectual property
  • William Joseph received a M.A. degree from New York University in 1993, and has been licensed for 29 years
  • William Joseph practices in Philadelphia, PA

Practice Areas Explained

William Joseph Castillo's Areas of Practice

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

Intellectual Property

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

William Joseph Castillo is one of 106,079 ip attorneys indexed nationally. Browse ip attorneys in Pennsylvania →

Jurisdictional Context

Why local counsel matters in Pennsylvania

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

Looking for additional Pennsylvania attorneys? Browse all attorneys in Philadelphia or all attorneys in Pennsylvania.

Frequently Asked

Common questions about William Joseph Castillo

Where is William Joseph Castillo's law office located?
William Joseph Castillo's law practice is located in Philadelphia, Pennsylvania. You can contact the office directly through this profile page.
What practice areas does William Joseph Castillo handle?
William Joseph Castillo focuses on ip. Each practice area listed reflects experience handling cases of that type in Pennsylvania.
How long has William Joseph Castillo practiced law?
William Joseph Castillo has 29+ years of legal experience and has been licensed since 1997.
Where did William Joseph Castillo go to law school?
William Joseph Castillo earned their education at (J.D., 1996); (M.A. Temple, 1993).
How can I contact William Joseph Castillo for a consultation?
You can contact William Joseph Castillo 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.

Practice Areas

Education

J.D.
Temple University
- 1996
M.A. Temple
New York University
- 1993

Bar Admissions

New York
Admitted: 1997
New Jersey
Admitted: 1997
U.S. District Court, District of New Jersey
Admitted: 1997
Pennsylvania
Admitted: 2004

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