Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7857108 | Brake assembly and control mechanism for a cart, and method | Keith Louis Amdahl | 2010-12-28 |
| 7448476 | Brake assembly and control mechanism for a cart, and method | — | 2008-11-11 |
| 6142283 | Cart management system | Keith Louis Amdahl, Christopher J. Rogney, Mark G. Bussey, Fred C. Zimmerman, Verne L. Severson | 2000-11-07 |
| 6125985 | Cart management system | Keith Louis Amdahl, Christopher J. Rogney, Mark G. Bussey, Fred C. Zimmerman, Verne L. Severson | 2000-10-03 |
| 5921373 | Cart management system | Keith Louis Amdahl, Christopher J. Rogney, Mark G. Bussey, Fred C. Zimmerman, Verne L. Severson | 1999-07-13 |
| 5526916 | Cart management system | Keith Louis Amdahl, Christopher J. Rogney, Verne L. Severson | 1996-06-18 |