Firm Profile

Senniger Powers LLP
100 North Broadway, 17th Floor
St. Louis, MO 63102
United States
(314) 345.7000

Firm Details

The legal team at Senniger Powers is intense — intensely curious, intensely thorough and intensely focused. We specialize in the preparation and prosecution of patents, copyrights and trademarks, and related litigation, representing all types of businesses from Fortune 500 companies to small start-ups, in industries such as life sciences, pharmaceuticals, manufacturing and software. In addition, most of our attorneys are engineers or scientists with advanced degrees and far-reaching experience in a variety of technical fields.

Many firms practice intellectual property law, but few have the combined scientific, technical and legal expertise necessary to maximize the opportunities that IP presents. Our attorneys and agents have more than 40 degrees in hard science and engineering, from organic chemistry to computer science to electrical, mechanical, chemical and metallurgical engineering. Our collaborative approach, combined with our technical experience, allows us to deliver insightful counsel, unique solutions and exceptional client service.

As the largest intellectual property firm in Missouri and one of the largest in the Midwest, we help clients across the country achieve a competitive advantage through strategic management of their IP portfolios.
By understanding the complexities and details of our clients’ endeavors, we are able to deliver exceptional client service and create enduring intellectual property strategies that help our clients achieve a competitive advantage.

Our litigators are experienced in handling a wide variety of intellectual property and complex commercial cases. We have received large verdicts on behalf of plaintiffs as well as obtained favorable defense judgments and settlements. We are proficient in handling the demands of high stakes litigation, both from a legal and technological standpoint. For example, e-discovery is managed in-house resulting in substantial cost savings to our clients. We have specially trained in-house staff, software, and servers that allow us to process and produce discovery efficiently and without the use of outside vendors. We are proud of the results we have obtained for our clients, big and small.


Robert M. Evans, Jr.
Chief Financial Partner
Kathleen M. Petrillo
Chief Operating Partner
Kurt F. James
Managing Partner

Top Listed State Awards

  • Top Listed in Missouri in Patent Law with 10 lawyers
  • Top Listed in Missouri in Trademark Law with 4 lawyers

Top Listed City Awards

  • Top Listed in St. Louis in Patent Law with 10 lawyers
  • Top Listed in St. Louis in Trademark Law with 4 lawyers


Paul I. Fleischut
Copyright Practice Group Leader
Robert E. Evans, Jr.
Litigation Practice Group Leader
Robert M. Bain
Patents--Business Methods and E-commerce Practice Group Leader
Kathleen M. Petrillo
Patents--Chemical Patent Practice Group Leader
Robert M. Bain
Patents--Electrical, Computer Systems & Software Practice Group Leader
Kathleen M. Petrillo
Patents--Life Sciences and Pharmaceuticals Practice Group Leader
Kurt F. James
Patents--Mechanical Patent Practice Group Leader
Paul I. Fleischut
Trademark Practice Group Leader

Firm Practice Areas

  • Commercial Litigation
  • Copyright Law
  • Litigation - Intellectual Property
  • Litigation - Patent
  • Patent Law
  • Trade Secrets Law
  • Trademark Law

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