Keithley Instruments, LLC
140Patents
100Active
140Granted
55Portfolio score
Filing activity: Sep 20, 1974 → Aug 16, 2023 · 37 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5594247A | Apparatus and method for depositing charge on a semiconductor wafer | Electricity | 82 | Expired |
| US8452567B1 | Test recipe distribution method and system | Physics | 78 | Active |
| US5834941A | Mobile charge measurement using corona charge and ultraviolet light | Electricity | 59 | Expired |
| US7009486B1 | Low noise power transformer | Electricity | 49 | Expired |
| US5386188A | In-circuit current measurement | Physics | 48 | Expired |
| USD861710S1 | Display screen with a graphical user interface for a measurement device | General | 34 | Active |
| US5918194A | Integrated modular measurement system having configurable firmware architecture and modular mechanical parts | Physics | 33 | Expired |
| US10746761B2 | Dynamically configurable remote instrument interface | Physics | 31 | Active |
| US5661310A | Radiation dose mapping systems and methods | Human Necessities | 25 | Expired |
| US5039934A | Control for voltage/current source with current/voltage limiting | Physics | 24 | Expired |
| US5999002A | Contact check for remote sensed measurement | Physics | 22 | Expired |
| US5644115A | Relay matrix switching assembly | Electricity | 20 | Expired |
| US5886530A | Test contact connection checking method and circuit | Physics | 17 | Expired |
| US5808475A | Semiconductor probe card for low current measurements | Physics | 16 | Expired |
| USD343799S | Electronic measuring/monitoring instrument | General | 16 | Expired |
| US6069484A | Source measure unit current preamplifier | Physics | 16 | Expired |
| US3979642A | Electronic protective circuit | Electricity | 15 | Expired |
| US5144154A | Range changing using N and P channel FETS | Electricity | 14 | Expired |
| USD343800S | Electronic measuring/monitoring instrument | General | 14 | Expired |
| US5559482A | Dual shielded relay reed pack | Electricity | 13 | Expired |
| US6522158B1 | Non-contact mobile charge measurement with leakage band-bending and dipole correction | Physics | 13 | Expired |
| USD854033S1 | Display screen with a graphical user interface for a measurement device | General | 13 | Active |
| US7240258B1 | Parallel test system and method | Physics | 13 | Expired |
| US5519328A | Compensation for dielectric absorption effect | Physics | 12 | Expired |
| US4843619A | Apparatus for measuring the peak voltage applied to a radiation source | Electricity | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.