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Karen Dana Oster

Patent application Attorney at Lake Oswego, OR

5.0   7 reviews

also known as Karen Dana Fienberg

  • Licensed for 28 years
    State OR
    Acquired 1995
    Active No misconduct found
  • Licensed for 32 years
    State CA
    Acquired 1991
    Resigned No misconduct found

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

About Karen

Learn Karen’s areas of practice.

Practice areas
  1. Patent application
    Preparation and Prosecution of patent applications before the United States Patent and Trademark Office. In other words, I help clients write patent applications and handle the process of obtaining a patent.

    31 years, 800 cases

  2. Patent infringement
    Mostly I provide analysis and opinions. For example, a client may ask me to provide a noninfringement opinion if they receive notice from a patent holder that they infringe a patent. I would also review competitors' products to determine if they infringe a client's patent.

    31 years, 50 cases

  3. Intellectual property
    Although I do not practice copyright, trademark, or other forms of intellectual property law, I do help clients identify issues in many intellectual property fields.

    31 years

With approximately thirty years of experience in patent prosecution (the process of getting a patent application), I take pride in being able to offer creative solutions to clients' real needs.  I will work with you to meet your patent goals.


I help obtain patent protection for mechanical devices (e.g. medical, tools, toys), software, business methods, and electrical apparatus. My services range from writing the patent application, to responding to Office actions from the United States Patent and Trademark Office, to obtaining and maintaining an issued patent.  I also help clients determine patentability and whether their product would infringe the intellectual property of others.


I am licensed to practice before the U.S. Patent and Trademark Office as well as in Oregon and California.  I represent clients from all over the world.

Contact Karen

Law Office of Karen Dana Oster, LLC
17791 SW Overlook Lane
Lake Oswego, OR, 97034


5.0 / 5.0
  7 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by Fadi | August 16, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Best Patent attorney in TOWN
Karen has been my patent attorney for over 10 years now. The knowledge Karen has when it comes to patents is unmatched in my opinion. I have filed over 15 patents with her, of those patents over 10 have been issued and some are still pending. She is honest and trustworthy, I cannot recommend her enough. She always answers my calls in timely fashion and her prices are fair. She has also shot down many of my ideas saving thousands of dollars that could have been wasted.
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Posted by anonymous | July 28, 2021
This review is from a person who hired this attorney.
| Hired Attorney
Patent Process and Assignment
Karen far exceeded our expectations in describing our technology for patent consideration. Her ability to ask great questions. Then apply those answers, thoughts and ideas along with our poorly written abstract into a clear vision for our patent was impressive. We would highly recommend her skills to anyone! Thank you Karen.
Posted by Greg | April 6, 2012
Karen was very professional in helping me understand patent law
Karen was kind enough to take the time to help me understand how patent law affected my business. She was professional and courteous and I would recommend her to anyone that was in the same situation as I.
Posted by Angela K. | April 6, 2012
I recommend Karen any chance I can!
Karen is a wonderful attorney that I recommend any chance I can. I have worked with her several times and throughout our work together she was very helpful - educating me about the formal patent process, the most effective way to protect my ideas and has always been very willing to teach me how to do some of the initial research myself - I am always very appreciative of attorneys who are willing to share knowledge that will save money, time and potential legal headaches in the future.
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Posted by Ralf | October 7, 2009
Professional Service - Patent Applications
The professional service provided by Karen Dana Oster has been beyond my expectations. I have worked with other law firms in the past but have not experienced the care and professionalism given by Ms. Oster.
Posted by anonymous | April 27, 2009
Assisted me with the patent process for a new product that I had invented
I found Karen through an inventor's group on LinkedIn network. After our initial conversation, I was very impressed with her knowledge of the patent process and the way she described the various options available to me. I worked remote with her from the Chicago area and she was always very responsive and respectful of my time and my questions/requests. Her rates are very reasonable and she does not nickle/dime you for every question as it is built into your costs. I would highly recommend her to friends and colleagues.
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Posted by anonymous | February 24, 2009
Comprehensive and thrifty.
Karen helped steer me away from some pitfalls that were recommended by large firms. She explained everything to me and assured me that we would get the same results with a simpler approach. That is how it worked in my case. Would I recommend her services? You bet I do it whenever I am asked. Mike Hyneman / KoneZone Trolling Flasher
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  • Free Consultation 30 minutes
  • Hourly Rates $ 250-300 per hour
Payment methods
Cash, Check


AVVO RATING 10.0 (Superb)

Work Experience

  • Patent Attorney
  • Law Office of Karen Dana Oster, LLC
  • 2002 - Present
  • Patent Attorney
  • Miller Nash LLP
  • 1999 - 2001
  • Patent Attorney
  • Chernoff, Vilhauer, McClung & Stenzel
  • 1994 - 1999
  • Patent Attorney
  • Poms, Smith, Lande & Rose
  • 1993 - 1994
View all work experience


  • California State University, Long Beach
  • BS - Bachelor of Science
  • 1992
  • Loyola Law School, Loyola Marymount University
  • JD - Juris Doctor
  • 1990
  • University of California - Santa Barbara
  • BA - Bachelor of Arts
  • 1987

Legal Cases

  • Resistant mechanical combination lock and improvements thereto
  • Issued Patent
  • Digital x-ray diagnosis and evaluation of dental disease
  • Issued Patent
  • Fixture de-embedding method and system for removing test fixture characteristics when calibrating measurement systems
  • Issued Patent
View all legal cases


  • Oregon Patent Law Association
  • Executive Committee
  • 2009 - Present
  • Institute of Electrical and Electronics Engineers
  • Intellectual Property Committee
  • 2009 - Present
  • National Association of Patent Practitioners
  • Member
  • 2007 - Present
  • NW Patent Network
  • Member
  • 2006 - Present
  • Oregon State Bar, Computer and Internet Law Section
  • Member
  • 2004 - Present
  • Oregon State Bar, Computer and Internet Law Section
  • Executive Committee
  • 2004 - Present
  • Oregon State Bar Intellectual Property Section
  • Member
  • 1994 - Present
  • Institute of Electrical and Electronics Engineers
  • Member
  • 1992 - Present
  • Oregon State Bar, Computer and Internet Law Section
  • Secretary
  • 2010 - 2010
  • Oregon State Bar, Intellectual Property Section
  • Chair
  • 2001 - 2001
  • Oregon State Bar, Intellectual Property Section
  • Executive Committee
  • 1994 - 2002
View all associations

Languages Spoken

  • English

Honors and Awards

  • AV Preeminent 5.0 out of 5 Peer Review Rated
  • Martindale-Hubbell
  • 2021
  • Preeminent AV rating
  • Martindale-Hubble
  • 2012
  • Senior Member
  • IEEE
  • 2011


  • Oregon State Bar Computer and Internet Law Section e-Commerce Deskbook
  • “Patents and E-Commerce”
  • 2009
  • Federal Circuit Patent Case Digests published by West Group
  • Federal Circuit Patent Case Digests
  • 2001

Speaking Engagements

  • Portland Womens Legal - CLE Presentation
  • What You and Your Clients Need To Know About Patent Reform
  • 2012
  • Portland Womens Legal - CLE Presentation
  • Developments in Patent Law
  • 2009
  • GameStorm
  • Altenatives for Patent Protection
  • 2009
  • Oregon State Bar Computer Law Section Annual CLE
  • Software Patent Basics
  • 2002
  • ORCNET Meeting
  • Protecting Intellectual Property Using Patents, Copyrights, Trademarks, and Trade Secrets
  • 2000
View all speaking engagements

Attorney endorsements

Received (4)
Given (7)
Endorse Karen
Patent application Attorney | Aug 20
Relationship: Fellow lawyer in community
"I endorse Karen for being a fair-minded and highly competent patent attorney. She has tremendous experience dealing with small clients and their inventions. She navigates her clients through the complex system of US and foreign patent offices. I highly recommend her for patent preparation and prosecution."
Intellectual property Attorney | Mar 28
Relationship: Fellow lawyer in community
"I own a small business designing software for patent attorneys (as well as being a patent attorney myself) and I frequently use Karen as a reference when trying to decipher the nuances of IP Law and the operations of the US PTO. She's a very clear thinker and really knows her stuff, and I have greatly benefited from her input over the past ten years."
Intellectual property Attorney | Oct 14
Relationship: Fellow lawyer in community
"Karen Oster gives good business advice. She knows how to assess a client's needs, whether the client is an individual person or a large corporation. Karen's patent documents are notable for their exquisite clarity, and her track record of successes is impressive. Her ability to stimulate a company's innovation and to provide a valuable Intellectual Property portfolio can be summed up in two words: "impressive" and "reliable.""
Intellectual property Attorney | Oct 05
Relationship: Co-worker
"I endorse this lawyer's work. She is very knowledgeable about the intricacies of practice before the U.S. Patent & Trademark Office. I have seen samples of her work and have been very impressed by their quality."
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Intellectual property
Lake Oswego Patent application Lawyer Karen Dana Oster
Karen Dana Oster
Patent application Attorney
Lake Oswego, OR
Licensed for 32 years
Free Consultation