Atty. John Robert Crossan
John Robert Crossan is a lawyer practicing intellectual property, patent application, patent infringement and 10 other areas of law. John received a B.S. degree from University of Virginia in 1969, and has been licensed for 52 years.
Intellectual Property & More Attorney · Serving Chicago, IL · 52+ Years Experience
Profile Summary
About John Robert Crossan at a Glance
John Robert Crossan is a Founder and Sole Member based in Chicago, Illinois, practicing at Crossan Intellectual Property Law, LLC. They have 52+ years of legal experience, licensed to practice since 1974. Their practice focuses on patent, trademark, copyright, ip, and trade secrets. Admitted to practice in Illinois (1974), U.S. District Court, Northern District of Illinois (1974), U.S. Court of Appeals for the Federal Circuit (1983), and U.S. Supreme Court (1985). Educated at University of Chicago Law School (J.D., 1973) and University of Virginia (B.S. Engineering, 1969). Recognitions include AV Preeminent. Serves clients in Chicago, IL and the surrounding metropolitan area.
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About John Robert Crossan
- John Robert Crossan is a lawyer practicing intellectual property, patent application, patent infringement and 10 other areas of law
- John received a B.S. degree from University of Virginia in 1969, and has been licensed for 52 years
- John practices at Crossan Intellectual Property Law, LLC in Chicago, IL
Practice Areas Explained
John Robert Crossan's Areas of Legal Practice
Each practice area below reflects the types of cases John Robert Crossan handles, with a practical overview of what that area of law involves and how it may apply to your situation in Chicago.
Patent Law in Chicago
John Robert Crossan is one of 20,632 patent attorneys indexed nationally. Browse patent attorneys in Illinois →
Trademark Law in Chicago
John Robert Crossan is one of 23,086 trademark attorneys indexed nationally. Browse trademark attorneys in Illinois →
Copyright Law in Chicago
John Robert Crossan is one of 17,404 copyright attorneys indexed nationally. Browse copyright attorneys in Illinois →
Intellectual Property in Chicago
IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.
John Robert Crossan is one of 105,285 ip attorneys indexed nationally. Browse ip attorneys in Illinois →
Trade Secrets in Chicago
John Robert Crossan is one of 6,604 trade secrets attorneys indexed nationally. Browse trade secrets 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 John Robert Crossan
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 John Robert Crossan's practice in the field of patent, trademark, copyright, ip, and trade secrets.
Decade-Tested Legal Experience
John Robert Crossan brings 52+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Multi-State Bar Admission
Licensed in Illinois, U.S. District Court, Northern District of Illinois, and U.S. Court of Appeals for the Federal Circuit, John Robert Crossan can represent clients in cases that span state lines or require counsel in multiple jurisdictions.
Broad Practice Area Coverage
Covering patent, trademark, and copyright, John Robert Crossan can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Chicago
A Chicago-based practice means John Robert Crossan 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 John Robert Crossan Handles in Chicago
Below is a representative sample of the types of matters John Robert Crossan 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 John Robert Crossan directly to discuss the specifics of your situation.
Search Reference
How People Find John Robert Crossan Online
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John Robert Crossan's Practice Areas & Specializations
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