Attorney profile
Trenner Law Firm, LLC
The short version
Trenner Law Firm, LLC is a Golden, Colorado patent and trademark practice led by USPTO-licensed attorney Mark Trenner, offering flat-fee IP services to inventors, entrepreneurs, and small businesses nationwide.
Strengths
- Flat-fee patent and trademark pricing with no hourly or administrative charges, and government fees stated separately
- Free 15-minute strategy session to map out patent or trademark options before committing
- Lead attorney combines electrical and environmental engineering credentials with 20+ years of IP practice, including senior patent counsel experience at NREL
- Full lifecycle support spanning prior art searches, provisional and utility applications, PCT strategy, Office Action responses, trademark appeals, and Section 8 and 15 maintenance filings
- Consistently praised for plain-English explanations and responsive communication, including outside standard business hours
Considerations
- At least one reviewer felt a provisional patent filing was overpriced relative to the work performed and that the timeline ran longer than expected
- Patent prosecution timelines can extend across multiple years, as noted in a first-time filer's account
- The practice operates largely remotely, with consultations and filings handled by phone, email, and online tools rather than in-person office visits
About Trenner Law Firm, LLC
Trenner Law Firm, LLC is an intellectual property practice based in Golden, Colorado, founded in 2004 by Mark Trenner, a USPTO-licensed patent attorney with a background in electrical and environmental engineering and more than two decades of IP experience, including service as in-house senior patent counsel at the National Renewable Energy Laboratory. The firm is licensed in Colorado and Tennessee and works with inventors, entrepreneurs, and small businesses across the country from its primary office on Denver West Parkway.
The practice covers both major branches of IP protection. Patent work includes personal prior art searches and patentability opinions, provisional applications, full utility patent applications, international and PCT foreign filing strategy, and USPTO Office Action responses. Trademark work includes full U.S. availability searches with attorney opinion letters, word marks and logo marks, use-in-commerce and intent-to-use filings, application drafting and filing, Office Action responses and appeals, plus post-registration maintenance such as Statements of Use, extensions of time, Section 8 and 15 affidavits, and ten-year renewals. Patent and trademark engagements are offered in Basic, Preferred, and Premium tiers, and the firm publishes flat-fee pricing rather than hourly or administrative charges, with government fees billed separately. A free 15-minute strategy session is available for prospective clients who are unsure which service fits their situation.
The firm’s positioning centers on translating between engineering and law. Because of his technical background, Trenner is presented as able to grasp complex hardware, software, and mechanical systems without an extended learning curve, and clients repeatedly describe the process as explained in plain language. Reviewers commonly highlight responsiveness, including contact outside regular business hours and rapid replies by phone and email, along with the predictability of flat-fee billing that appeals to startups and first-time filers. Several long-running client relationships appear in the review record, spanning multiple patents and trademarks over years.
Most work is handled remotely through phone, email, and online tools, and one reviewer noted never meeting the team in person. The most common practical caveats are timeline and cost: patent prosecution can run for years, and at least one reviewer felt a provisional filing was expensive relative to the work involved. Flat fees cover attorney work only, so USPTO government fees remain the client’s responsibility, and current tier pricing requires contacting the firm directly.
Recurring feedback
What clients consistently mention
- Responsiveness and accessibility: reviewers frequently note quick replies, phone availability, and contact outside standard business hours
- Clear, jargon-free explanations of patent and trademark procedures, valued especially by first-time filers
- Flat-fee billing and predictable costs, repeatedly cited as important by startups and small businesses
- Successful outcomes across patent grants, trademark registrations, and reversals of prior denials or adverse USPTO actions
- Long-term, repeat engagements covering multiple patents and trademarks over several years, alongside occasional concerns about cost relative to scope and extended timelines
All reviews
4.9 out of five stars based on 56 reviews.
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