Dedicated to Protecting Ideas
Award-winning intellectual property law, IP strategy services, and advisement. We are passionate about helping you protect your best thinking.
Patent of the Month: Vehicle with Frunkgate
Frunkgate: US 10,676,137 has issued for something you didn’t know you wanted, a “tailgate” on the front of your car.
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Recognized by Best Lawyers
David Carstens, Vince Allen and Colin P. Cahoon have been recognized in the 27th Edition of The Best Lawyers in America© for their high caliber of work.
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We are trusted legal advisors to some of the world’s leading companies.

Carstens & Cahoon is an award-winning intellectual property law firm. We help mid market clients and venture-backed startups with patent, trademark, and copyright law matters.


Patent litigation, prosecution, international filings, counseling


Trademark acquisition, litigation, and international filings

IP Strategy

Landscape studies, white space analysis, freedom to operate counsel

Customer Relationships May Not Be Trade Secrets

In a relatively recent order denying a plaintiff’s application for preliminary injunction, Judge Mazzant of the U.S. District Court for the Eastern District of Texas, Sherman Division, considered whether certain “customer relationships” established by the plaintiff oil and gas investment firm constituted a “trade secret.” The defendants had left their …

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Challenges to Patent Validity at the USPTO PTAB

An Inter Partes Review (IPR) is a trial held before the Patent Trial and Appeal Board (PTAB) that determines whether a given patent is valid. Filing an IPR means that you are challenging an existing patent. With every type of patent eligible for review, IPRs are becoming more common and troublesome. …

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