Atty. William John Cassin
William John Cassin is a lawyer practicing intellectual property. William received a B.S. degree from University of Illinois at Urbana-Champaign in 2000, and has been licensed for 20 years.
Intellectual Property Attorney · Serving Chicago, IL · 20+ Years Experience
Profile Summary
About William John Cassin at a Glance
William John Cassin is an Associate based in Chicago, Illinois, practicing at Schiff Hardin LLP. They have 20+ years of legal experience, licensed to practice since 2006. Their practice focuses on ip. Admitted to practice in Illinois registered to practice before U.S. Patent and Trademark Office (2006). Educated at Loyola University Chicago School of Law (J.D., 2006) and University of Illinois at Urbana-Champaign (B.S. Mechanical, 2000). Serves clients in Chicago, IL and the surrounding metropolitan area.
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About William John Cassin
- William John Cassin is a lawyer practicing intellectual property
- William received a B.S. degree from University of Illinois at Urbana-Champaign in 2000, and has been licensed for 20 years
- William practices at Schiff Hardin LLP in Chicago, IL
Practice Areas Explained
William John Cassin's Areas of Legal Practice
Each practice area below reflects the types of cases William John Cassin handles, with a practical overview of what that area of law involves and how it may apply to your situation in Chicago.
Intellectual Property in Chicago
IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.
William John Cassin is one of 105,285 ip attorneys indexed nationally. Browse ip attorneys in Illinois →
Jurisdictional Context
Why Local Counsel Matters in Chicago
Practicing law in Illinois. Legal matters in Illinois are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Chicago are typically filed in the local municipal court or the appropriate Illinois state district court, depending on subject matter and amount in controversy. An attorney licensed in Illinois brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Illinois courts without local counsel or pro hac vice admission.
Chicago Courts and Legal Process
Choosing a Chicago-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
Looking for additional Illinois attorneys? Browse all attorneys in Chicago or all attorneys in Illinois.
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Professional Profile
Why Clients in Chicago Choose William John Cassin
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish William John Cassin's practice in the field of ip.
Decade-Tested Legal Experience
William John Cassin brings 20+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Focused IP Practice
Concentrating on ip means William John Cassin's knowledge of relevant statutes, case law, and procedural nuances stays current — unlike generalist practices that spread attention across unrelated fields.
Local Presence in Chicago
A Chicago-based practice means William John Cassin attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
Case Types
Common Legal Issues William John Cassin Handles in Chicago
Below is a representative sample of the types of matters William John Cassin has experience with under Illinois law. If your situation involves one of these case categories, this attorney may be well positioned to help you understand your options.
This list is illustrative, not exhaustive. Contact William John Cassin directly to discuss the specifics of your situation.
Search Reference
How People Find William John Cassin Online
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William John Cassin's Practice Areas & Specializations
Education & Law School Background
Bar Admissions & Licensed Jurisdictions
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