Koss Corporation
99Patents
62Active
99Granted
48Portfolio score
Filing activity: Jun 21, 1974 → Nov 13, 2024 · 6 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4418248A | Dual element headphone | Electricity | 142 | Expired |
| USD255352S | Headphone | General | 113 | Expired |
| USD317767S | Headphone or similar article | General | 112 | Expired |
| US4302635A | Headphone construction | Electricity | 97 | Expired |
| USD244300S | Headphone | General | 89 | Expired |
| US8737668B1 | Headband for personal speakers | Electricity | 88 | Active |
| USD301145S | Stereophone or similar article | General | 86 | Expired |
| US4404434A | Collapsible stereophone | Electricity | 70 | Expired |
| USD626948S1 | Earphone | General | 67 | Expired |
| USD618669S1 | Earphone | General | 57 | Expired |
| US5333206A | Dual element headphone | Electricity | 50 | Expired |
| USD435036S | Stereophone ear plug | General | 48 | Expired |
| US4965836A | Stereo headphone | Electricity | 46 | Expired |
| US8190203B2 | Wireless earphone that transitions between wireless networks | Electricity | 45 | Active |
| US5132890A | Power supply based on normally parasitic resistance of solid state switch | Emerging Cross-Sectional Technologies | 41 | Expired |
| USD627338S1 | Earphone dial | General | 39 | Expired |
| US8571544B2 | System with wireless earphones | Electricity | 38 | Active |
| US9049502B2 | System with wireless earphones | Electricity | 33 | Active |
| US4899388A | Infrared stereo speaker system | Emerging Cross-Sectional Technologies | 31 | Expired |
| USD449592S | Stereophone ear plug insert | General | 30 | Expired |
| US5109424A | Stereo headphones with plug, receptacle and securing plates | Electricity | 29 | Expired |
| US8655420B1 | Wireless earphone set | Electricity | 28 | Active |
| US8249286B2 | Interconnecting earphones | Electricity | 27 | Active |
| US8861770B2 | Headband for personal speakers | Electricity | 27 | Active |
| USD244213S | Headphone earpiece | General | 26 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.