Axel Grell
18Patents
5h-index
30Co-inventors
62Inventor score
Filing activity: Aug 22, 2002 → Feb 22, 2018
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7292703B2 | Headphones | Electricity | 18 | Expired |
| US9247337B2 | Headphone and headset | Electricity | 8 | Active |
| US9918179B2 | Methods and devices for reproducing surround audio signals | Electricity | 8 | Active |
| US7639832B2 | Headphones | Emerging Cross-Sectional Technologies | 6 | Expired |
| US8885834B2 | Methods and devices for reproducing surround audio signals | Electricity | 6 | Active |
| US9635484B2 | Methods and devices for reproducing surround audio signals | Electricity | 5 | Active |
| US7940947B2 | Headphone set | Electricity | 5 | Active |
| US6934401B2 | Closed headphones with transducer system | Electricity | 4 | Expired |
| US7162051B2 | Headphone | Electricity | 4 | Expired |
| US8103015B2 | Wire-free headset, portable media player | Electricity | 3 | Active |
| US8180092B2 | Converter system for an active noise compensation apparatus | Electricity | 3 | Active |
| US10178465B2 | Headphone unit | Electricity | 2 | Active |
| US8731231B2 | Dynamic sound transducer and receiver | Electricity | 2 | Active |
| US8215445B2 | Electroacoustic transducer | Electricity | 2 | Active |
| US8363874B2 | Receiver | Electricity | 1 | Active |
| US10128806B2 | Method of controlling an audio amplifier unit and audio amplifier unit | Electricity | 0 | Active |
| US10477293B2 | Headphone | Electricity | 0 | Active |
| US8295530B2 | Headphones and headset | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.