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David Hamlin Madden

Intellectual property Attorney at Tigard, OR

5.0   2 reviews

also known as Dave Madden

  • State Years
    Oregon - OR 16 years
    California - CA 20 years
    Utah - UT 5 years
  • Licensed for 16 years
    State OR
    Acquired 2008
    Active No misconduct found
  • Licensed for 20 years
    State CA
    Acquired 2003
    Active No misconduct found
  • Licensed for 5 years
    State UT
    Acquired 2019
    Administrative - Not authorized to practice No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About David

Learn David’s areas of practice.

Practice areas
  1. Intellectual property
    Patent prosecution, infringement analysis, freedom-to-operate work, and design around engineering.

    20 years

  2. Business
    Start-up consulting and integrated strategy planning.

    17 years

You'll have a hard time finding a better engineer to be your lawyer (or a better lawyer to do engineering work for you, if that's what you need!)  I live for the thrill of figuring out how, whether it's "how to get a transistor to do what you want," or "how to convince the judge of my client's position."  My background is obviously good for patent work, but I consider my legal skills to be just another tool to be used when appropriate.  You know what they say: "If the only tool you have is a hammer, every problem looks like a thumb!"  Not every problem can be solved by a contract or a lawsuit, but almost every problem can be solved.  My goal is to solve my clients' problems in the most efficient and economical manner.


If you've got a run-of-the-mill problem, take it to a run-of-the-mill lawyer.  But if you've got a problem that has your regular attorney stumped, give me a call.  If it's really a tough one, you'll make my day!

Photos and videos

Any fool can get a law degree.  But it takes a damn fool to ride a bike year-round in Portland.  (My son's not a damn fool yet, but he'll come around eventually.  Maybe after law school.)


Mersenne Law LLP
9600 S.W. Oak Street
Suite 500
Tigard, OR, 97223


5.0 / 5.0
  2 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by Teresa | April 2, 2019
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Helpful guidance on copyright infringement case
I contacted Dave based on a friend's recommendation, and his free inItial consult was exactly what I needed. I liked him. Now I have a good plan for my next steps and I know under what conditions I should hire him.
Posted by Evan Yemel | December 24, 2009
very helpful, polite, and knowledgeable!
I had an issue with a trademark search, and Mr. Madden really helped me out by explaining the situation very clearly. Thanks again David.


  • Free Consultation 30 minutes
  • Hourly Rates $ 225-325 per hour
Payment methods
Cash, Check


AVVO RATING 9.5 (Superb)

Work Experience

  • Patent Attorney
  • Mersenne Law LLC
  • 2009 - Present
  • Associate
  • Blakely, Sokoloff, Taylor & Zafman
  • 2004 - 2007


  • Southwestern School of Law
  • JD
  • 2003
  • Johns Hopkins University
  • BS - Bachelor of Science
  • 1985

Sample of Legal Cases

  • Adaptive entropy coding compression output formats
  • Patent U.S.7,605,721 Granted


  • Multnomah Bar Association
  • Member
  • 2009 - Present
  • Oregon State Bar, Solo & Small Firms Section
  • Board Member
  • 2009 - Present

Languages Spoken

  • Japanese

Honors and Awards

  • Remedies
  • Computer Assisted Legal Education
  • 2003

Speaking Engagements

  • OTBC Lunch Talk
  • Bad Patent!
  • 2010

Attorney endorsements

Received (6)
Given (6)
Endorse David
Intellectual property Attorney | Nov 07
Relationship: Worked together on matter
"I endorse this lawyer."
Intellectual property Attorney | Oct 10
Relationship: Worked together on matter
"Dave is a terrific guy, and one of the most competent attorneys I've had the pleasure of working with. Dave's knowledge of substantive copyright law is excellent, but what sets him apart is how well versed he is in the tendencies and temperaments of the judges in his district. Good lawyers stay on top of all of their own cases, but great lawyers go beyond that, aspiring to stay on top of all the cases that have the potential to affect their entire practices. Dave is a great lawyer."
Unknown Attorney | Nov 05
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Intellectual property Attorney | Dec 12
Relationship: Other
"I endorse this lawyer's work. He is a savvy fellow with a quick wit and a sharp tongue. He will make it simple for you, which is all you can ask of a lawyer."
Intellectual property Attorney | Dec 10
Relationship: Fellow lawyer in community
"I endorse this lawyer's work. In addition to providing brilliant legal analysis, Mr. Madden also boasts a wicked sense of humor that he incorporates into his responses."
Patent application Attorney | Dec 02
Relationship: Worked together on matter
"I endorse this lawyer's work."
View more endorsements
Copyright infringement
Patent application
General practice
Intellectual property