| 78593539 | LABTRACER | Keithley Instruments, Inc. | 3140452 |
| 74086083 | VIEWDAC | KEITHLEY INSTRUMENTS, INC. | 1724576 |
| 75741519 | WHEN THE MEASUREMENT MATTERS | Keithley Instruments, Inc. | 2840493 |
| 85540067 | INTUITOUCH | Keithley Instruments, Inc. | — |
| 77133147 | SEGMENT ARB | Keithley Instruments, Inc. | 3463438 |
| 75337833 | COMMENGINE | Keithley Instruments, Inc. | — |
| 75337832 | SMARTCONFIGURATION | Keithley Instruments, Inc. | — |
| 75242912 | SMARTDAQ | Keithley Instruments, Inc. | — |
| 75207835 | WORK = POWER X TIME | Keithley Instruments, Inc. | — |
| 75207834 | TRIAD ACCREDIT | Keithley Instruments, Inc. | 2173827 |
| 75207833 | TIME=WORK POWER | Keithley Instruments, Inc. | — |
| 75207832 | POWER=WORK TIME | Keithley Instruments, Inc. | — |
| 74592857 | DMMCARD | Keithley Instruments, Inc. | — |
| 74566700 | VTX | Keithley Instruments, Inc. | 2046941 |
| 74566607 | VISUAL TEST EXTENSIONS | Keithley Instruments, Inc. | 2002172 |
| 74507579 | SPECDIRECT | Keithley Instruments, Inc. | 1925793 |
| 74503665 | DASCARD | Keithley Instruments, Inc. | 2006593 |
| 74502559 | VISUALDAS | Keithley Instruments, Inc. | — |
| 74100709 | WORKHORSE | KEITHLEY INSTRUMENTS, INC. | 1655455 |
| 72164251 | K | KEITHLEY INSTRUMENTS, INC. | 0770767 |
