Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4412551 | Apparatus for cleaning hydraulic fluid system | Leroy W. Peters | 1983-11-01 |
| D269190 | Combined vending machine and storage cabinet unit | Albert K. Grethey | 1983-05-31 |
| D262894 | Vending machine cabinet | Albert K. Grethey | 1982-02-02 |
| D256031 | Vending machine | Albert K. Grethey | 1980-07-22 |
| D255907 | Cigarette vending machine | Albert K. Grethey | 1980-07-15 |
| D255908 | Cigarette vending machine | Albert K. Grethey | 1980-07-15 |