Robert D. Johnston
14Patents
6h-index
9Co-inventors
59Inventor score
Filing activity: Oct 13, 1983 → May 26, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4747064A | Approaching vehicle informing system and method | Physics | 33 | Expired |
| US4577071A | Echo canceller with adaptive residual center clipper controlled by echo estimate | Electricity | 22 | Expired |
| US10512868B2 | Filter cartridges; air cleaner assemblies; housings; features; components; and, methods | Performing Operations; Transporting | 20 | Active |
| US11198083B2 | Filter cartridges; air cleaner assemblies; housings; features; components; and, methods | Performing Operations; Transporting | 14 | Active |
| US4782459A | Adaptive recognizing device | Electricity | 8 | Expired |
| US11660558B2 | Filter cartridges; air cleaner assemblies; housings; features; components; and, methods | Performing Operations; Transporting | 7 | Active |
| US11318405B2 | Air cleaner assemblies and methods of use | Performing Operations; Transporting | 4 | Active |
| US10864469B2 | Air cleaner assemblies and methods of use | Performing Operations; Transporting | 4 | Active |
| US6603836B1 | Interactive voice response apparatus capable of distinguishing between user's incoming voice and outgoing conditioned voice prompts | Electricity | 3 | Expired |
| US11951433B2 | Air cleaner assemblies and methods of use | Performing Operations; Transporting | 0 | Active |
| US11684882B2 | Air cleaner assemblies and methods of use | Performing Operations; Transporting | 0 | Active |
| US12214307B2 | Air cleaner assemblies and methods of use | Performing Operations; Transporting | 0 | Active |
| US12070710B2 | Filter cartridges; air cleaner assemblies; housings; features; components; and, methods | General | 0 | Revoked |
| USRE34205E | Adaptive recognizing device | General | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.