U.S. Patent & Trademark Attorney
Grand Rapids roots. Michigan proud.
U.S. licensed. Global reach.
Oppenhuizen Law PLC serves inventors, small and mid-sized businesses, and foreign attorneys and their clients — from Grand Rapids to clients across the U.S. and around the world.
✦ 100+ Patents Issued Across Multiple Industries
✦ 650+ Trademark Registrations in 40+ Countries
✦ USPTO-Registered Patent Attorney Since 2006
✦ USPTO-Registered Patent Attorney Since 2006 ✦ 20+ Years of IP Experience ✦ Engineering Background ✦ Clients in the U.S., Europe, Asia & Australia ✦ $250 Initial Consultation — Applied Toward Your Matter if Retained
You’ll Work Directly With David. Every Time.
David Oppenhuizen is a USPTO-registered patent attorney with over 20 years of experience helping inventors and businesses protect their intellectual property. He holds a Bachelor of Science in Mechanical Engineering from Kettering University and a law degree with a certified specialization in Intellectual Property from Michigan State University College of Law.
Before practicing law, David worked as a design engineer — giving him a genuine technical advantage in understanding and protecting his clients’ inventions. That engineering background, combined with 20+ years before the USPTO, means you get an attorney who truly understands what you’ve built.
At Oppenhuizen Law, you will always work directly with David — not a junior associate, not a paralegal. Every client gets his full attention, honest advice, and a strategy tailored to their specific situation. His clients include individual inventors, small and mid-sized businesses, and foreign attorneys and their clients from the Netherlands, the UK, Germany, Australia, Japan, Canada, Turkey, the Czech Republic, and beyond.
Patents
From provisional applications to full utility and design patents, David protects your inventions and gives you a competitive edge — whether you’re a first-time inventor or an established manufacturer.
- Provisional patent applications
- Utility & design patents
- PCT & international patents
- Patent searches & opinions
- Post-issuance proceedings
Trademarks
Your brand is one of your most valuable assets. David handles the full trademark process — from clearance searches to federal registration — so you can build your brand with confidence.
- Trademark searches & opinions
- Federal & state registration
- Common law trademark counsel
- Foreign trademark registration
- Cease & desist letters
IP Strategy & More
Protecting your IP is about more than filing paperwork. David helps you build a complete strategy around your innovations and brand — and helps you make money from them.
- Copyright registration
- Non-disclosure agreements
- Licensing agreements
- Infringement & validity opinions
- Domain name disputes
Transparent, Flat-Fee Pricing
One of the most common concerns clients have is not knowing what their legal fees will be. At Oppenhuizen Law, David offers flat-fee pricing for most core services — so you know exactly what you’re paying before any work begins.
Flat-fee services include: provisional patent applications, utility patent applications, trademark searches, trademark filings, copyright applications, USPTO maintenance fee payments, issue fee payments, trademark Statements of Use, and many other routine USPTO matters.
For work that falls outside these defined services, David charges an hourly rate and will always discuss scope and estimated costs with you upfront.
Ready to find out what it would cost to protect your idea? Schedule a consultation.
Representative Patents
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Golf Ball Retriever — Utility Patent No. US 8,944,480 (2015) Consumer product, Michigan inventor Innovative retrieval device protecting a Michigan inventor’s product. |
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Backpack Sprayer Tank — Design Patent No. US D1,114,939 (2026) Industrial manufacturer, Lowell, MI Industrial product design patent for a Michigan-based manufacturer. |
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Proximal Femoral De-Rotation Nail — Utility Patent No. US 11,737,796 (2023) International client, Turkey Complex medical device patent obtained for an international client. |
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Modular Gage System — Utility Patent No. US 11,692,801 (2023) Precision manufacturer, Grand Rapids, MI Precision measurement system for a Grand Rapids manufacturer. |
Representative Trademarks
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CHATEAU GRAND TRAVERSE — Reg. No. 5,506,835 (2018) Michigan winery Federal trademark for one of Michigan’s most recognized wineries. |
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EMBER — Reg. No. 6,861,269 (2022) Recreational vehicle manufacturer, Indiana Brand protection for a fast-growing Midwest RV manufacturer. |
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SAINT JOSEPH’S COLLEGE OF INDIANA — Reg. No. 8,053,713 (2025) Educational institution, Indiana Service mark registration for educational services. |
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ORIENTICA Perfumes Bottle Design — Reg. No. 7,448,460 (2024) International client, United Arab Emirates International client trademark — illustrating Oppenhuizen Law’s global reach. |
What Clients Are Saying
⭐⭐⭐⭐⭐ Rated 5 Stars on Google
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“David Oppenhuizen was fundamental to have my business name registered without complications. He is extremely knowledgeable and responsible. He informed me of the entire process and what to expect on our first conversation, and he kept me informed during all phases. I will happily recommend his services to everyone.” — Felipe Porto ⭐⭐⭐⭐⭐ |
“David was absolutely amazing to work with and very knowledgeable. I highly recommend any small business to work with him.” — Tracy ⭐⭐⭐⭐⭐ |
“David is a very professional and pleasant person, and it has been simply a joy to engage with him. His fees are very reasonable compared to large IP firms, and I cannot think of any reason why not to use his services.” — Nicolas Lategan ⭐⭐⭐⭐⭐ |
Trusted by Clients & Foreign Attorneys Worldwide
“Over the course of more than ten years, I have engaged David Oppenhuizen on a wide range of U.S. intellectual property matters on behalf of my Canadian clients. He delivers consistently high-quality legal analysis, particularly in complex trademark opposition and cancellation proceedings, as well as U.S. patent appeals. His advice is practical, his communication is efficient and reliable, and his billing is fair. He is a trusted U.S. associate whom I confidently recommend.”
— Sander Gelsing, Canadian patent and trademark attorney, Warren Sinclair LLP
“I have known David since 1996. He is one the brightest minds I’ve ever met and why I chose him for my ongoing patent attorney for over 20 years. He is thorough, detailed, and diligent. I’ve watched his firm grow to what I would only describe as excellence in service and delivery.”
— Zac Ball, CEO, Owner, Inventor, Entrepreneur
“[Testimonial coming soon]”
— [Name, Company/Firm, Location]
Ready to Protect Your Business?
The initial consultation is $250, applied toward your matter if you retain us. You’ll leave with a clear picture of your options, a recommended strategy, and flat-fee pricing for your specific situation.
Or call us directly: +1 (616) 242-9550