Atty. William Blumenthal
William Blumenthal is a lawyer practicing mergers / acquisitions, intellectual property, m&a corporate and 1 other area of law. William received a A.B. degree from Brown University in 1977, and has been licensed for 46 years.
Intellectual Property & More Attorney · Serving Washington, DC · 46+ Years Experience
Profile Summary
About William Blumenthal at a Glance
William Blumenthal is a Partner based in Washington, District of Columbia, practicing at Clifford Chance LLP. They have 46+ years of legal experience, licensed to practice since 1980. Their practice focuses on ip and m&a. Admitted to practice in District of Columbia (1980). Educated at Harvard University (J.D., 1980) and Brown University (A.B. Brown, 1977). Recognitions include AV Preeminent. Serves clients in Washington, DC and the surrounding metropolitan area.
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About William Blumenthal
- William Blumenthal is a lawyer practicing mergers / acquisitions, intellectual property, m&a corporate and 1 other area of law
- William received a A.B. degree from Brown University in 1977, and has been licensed for 46 years
- William practices at Clifford Chance LLP in Washington, DC
Practice Areas Explained
William Blumenthal's Areas of Legal Practice
Each practice area below reflects the types of cases William Blumenthal handles, with a practical overview of what that area of law involves and how it may apply to your situation in Washington.
Intellectual Property in Washington
IP attorneys protect inventions, brands, and creative work through patent prosecution, trademark registration, copyright, and trade-secret enforcement.
William Blumenthal is one of 105,285 ip attorneys indexed nationally. Browse ip attorneys in District of Columbia →
Mergers & Acquisitions in Washington
William Blumenthal is one of 49,430 m&a attorneys indexed nationally. Browse m&a attorneys in District of Columbia →
Jurisdictional Context
Why Local Counsel Matters in Washington
Practicing law in District of Columbia. Legal matters in District of Columbia are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Washington are typically filed in the local municipal court or the appropriate District of Columbia state district court, depending on subject matter and amount in controversy. An attorney licensed in District of Columbia 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 District of Columbia courts without local counsel or pro hac vice admission.
Washington Courts and Legal Process
Choosing a Washington-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 District of Columbia attorneys? Browse all attorneys in Washington or all attorneys in District of Columbia.
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Professional Profile
Why Clients in Washington Choose William Blumenthal
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 Blumenthal's practice in the field of ip and m&a.
Decade-Tested Legal Experience
William Blumenthal brings 46+ years of hands-on legal practice — enough to have navigated the recurring fact patterns, procedural traps, and negotiation dynamics that shape case outcomes.
Broad Practice Area Coverage
Covering ip and m&a, William Blumenthal can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Washington
A Washington-based practice means William Blumenthal 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 Blumenthal Handles in Washington
Below is a representative sample of the types of matters William Blumenthal has experience with under District of Columbia 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 Blumenthal directly to discuss the specifics of your situation.
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How People Find William Blumenthal Online
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William Blumenthal's Practice Areas & Specializations
Education & Law School Background
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