About Us


Christensen Fonder Dardi PA

Christensen Fonder Dardi is an intellectual property law firm of experienced attorneys providing creative and effective legal services and representation to clients throughout the world. We provide a broad range of legal services, including U.S. and international patent preparation and prosecution, patent opinions, intellectual property litigation, patent post-grant proceedings, trademark search and acquisition, copyright registration, licensing, due diligence and portfolio management.

In addition to a robust U.S. legal practice that includes representation before the U.S. Patent & Trademark Office and U.S. federal courts, our firm also procures and protects intellectual property assets outside the U.S. through a network of established and trusted intellectual property law firms practicing in dozens of countries throughout the globe.  Our attorneys, paralegals, and legal administrators have decades of combined experience preparing and filing patent and trademark applications in foreign countries.  Our international team includes both U.S. and foreign-based attorneys that are particularly well-versed in Asian and European intellectual property practices.

Whether domestic or foreign, our select team of attorneys and technology experts are dedicated to providing thoughtful, strategic and effective advice to our clients.  In addition to being knowledgeable in all areas of intellectual property law, most of our skilled attorneys have earned advanced degrees, enabling them to quickly grasp complicated technological ideas, and guide our clients’ intellectual property strategies.

We believe that our experienced attorneys, creative solutions, and personal service set us apart from other firms.

What Our Clients Say

I went through 14 different patent law firms before I found Doug Christensen and if I can retire with him as my outside patent attorney I will be very content.

– Head in-house patent attorney of a Fortune 500 corporation

“Good thing you aren’t here, I’d probably kiss you.” Said to Doug Christensen on a phone call with a CEO of a soon to be a NASDAQ listed corporation after the three arbitrator panel released a “no infringement finding of the client’s product following a two week arbitration first chaired by Doug Christensen.

– CEO of a NASDAQ listed corporation

I am a very demanding client, and the work product I expect and get from Christensen Fonder law firm is always brilliant.

– Vice President in charge of intellectual property, Fortune 500 International High Technology and Consumer Product Company

We were so lucky and happy to have found John Fonder after going through several other patent attorneys.

– Overseas Corporate Client with China Manufacturing Operations

Christensen Fonder Dardi adds value to everything that they touch.

– Inside Patent Attorney for NYSE listed outdoor consumer products company having multiple brands.