Essex Electronics
18Patents
9Active
18Granted
40Portfolio score
Filing activity: Jan 30, 1992 → Apr 6, 2022 · 4 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5231326A | Piezoelectric electronic switch | Electricity | 90 | Expired |
| US5674018A | Weatherproof electronic keypad with replaceable graphics overlay | Electricity | 21 | Expired |
| USD724588S1 | Smart card RFID reader | General | 7 | Active |
| USD459671S1 | Keypad | General | 6 | Expired |
| USD686932S1 | Proximity sensor | General | 6 | Active |
| USD686931S1 | Proximity sensor | General | 6 | Active |
| USD639194S1 | Proximity sensor | General | 5 | Expired |
| USD639195S1 | Proximity sensor | General | 4 | Expired |
| USD634662S1 | Proximity sensor | General | 3 | Expired |
| USD634661S1 | Proximity sensor | General | 3 | Expired |
| US11328546B2 | Method and apparatus for operating a RFID system | Physics | 2 | Active |
| USD738882S1 | Touchless microwave switch | General | 2 | Active |
| US10020571B2 | Antenna mounting system for metallic structures | Electricity | 1 | Active |
| USD491087S1 | Keypad | General | 1 | Expired |
| US11995936B2 | Method and apparatus for operating a RFID system | Physics | 0 | Active |
| US7063471B2 | Access control apparatus | Physics | 0 | Expired |
| US11594089B2 | Touchless motion sensor systems for performing directional detection and for providing access control | Physics | 0 | Active |
| US9140757B2 | Testing a circuit assembly that contains a piezoelectric switch | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.