Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9727850 | Secure electronic cash-less payment systems and methods | David A. Stark | 2017-08-08 |
| 6142283 | Cart management system | Keith Louis Amdahl, Dan L. Otterson, Christopher J. Rogney, Mark G. Bussey, Fred C. Zimmerman | 2000-11-07 |
| 6125985 | Cart management system | Keith Louis Amdahl, Dan L. Otterson, Christopher J. Rogney, Mark G. Bussey, Fred C. Zimmerman | 2000-10-03 |
| 6092057 | Unattended POS system for automatic control of bank system rejections | Fred C. Zimmerman | 2000-07-18 |
| 5921373 | Cart management system | Keith Louis Amdahl, Dan L. Otterson, Christopher J. Rogney, Mark G. Bussey, Fred C. Zimmerman | 1999-07-13 |
| 5526916 | Cart management system | Keith Louis Amdahl, Dan L. Otterson, Christopher J. Rogney | 1996-06-18 |
| 5384832 | Method and apparatus for a telephone message announcing device | Fred C. Zimmerman | 1995-01-24 |
| 5378067 | Network interface apparatus and method for reducing conflicts through the use of times | John Hardy | 1995-01-03 |
| 4491933 | Word processor | Thomas N. Ursin | 1985-01-01 |
| D276231 | Word processor | Charles R. Frigard, Thomas N. Ursin, Virgil A. Kluesner, Fredric C. Zimmerman | 1984-11-06 |
| 4271403 | Coaxial cable switching circuit | Charles E. Tomfohrde | 1981-06-02 |
| 4220931 | Composite video automatic gain control amplifier | William E. Hines | 1980-09-02 |