Klarquist represents a broad range of clients, from solo inventors and mid-size companies, to some of the largest, most prestigious companies in the world.
| A-dec, Inc. | Oregon State University |
| Alaska Airlines | Portland State University |
| Amazon.com, Inc. | Rutgers, The State University of New Jersey |
| Battelle Memorial Institute (PNNL) | Salk Institute for Biological Studies |
| Capsugel, Inc. | Shaklee Corporation |
| Centers for Disease Control and Prevention | Taylor Made Golf Company, Inc. |
| Daimler Truck North America, LLC (Freightliner) | Thermo Fisher Scientific Inc. |
| Emory University | TransluSense, LLC |
| General Electric Company (GE) | Triad National Security, LLC (Los Alamos National Laboratory) |
| Microsoft Corporation | University of Arizona |
| MWI Veterinary Supply Co. | University of Idaho |
| National Institutes of Health | University of Oregon |
| Nikon Corporation | University of Pittsburgh |
| Oak Ridge National Laboratory/UT-Battelle | UVic Industry Partnership, Inc. |
| Oregon Health & Science University | Washington State University |