American Technology Corporation
80Patents
5Active
80Granted
41Portfolio score
Filing activity: Apr 15, 1976 → Apr 21, 2008 · 5 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4256115A | Leadless cardiac pacer | Human Necessities | 340 | Expired |
| US5689269A | GPS relative position detection system | Physics | 183 | Expired |
| US5781150A | GPS relative position detection system | Physics | 134 | Expired |
| US5859915A | Lighted enhanced bullhorn | Electricity | 102 | Expired |
| US5889870A | Acoustic heterodyne device and method | Electricity | 92 | Expired |
| US4539708A | Ear radio | Electricity | 87 | Expired |
| US6229899A | Method and device for developing a virtual speaker distant from the sound source | Electricity | 87 | Expired |
| US4149178A | Pattern generating system and method | Electricity | 84 | Expired |
| US5952959A | GPS relative position detection system | Physics | 79 | Expired |
| US5932240A | Multidose transdermal drug delivery system | Human Necessities | 68 | Expired |
| US7109789B2 | Modulator—amplifier | Electricity | 64 | Expired |
| US6584205B1 | Modulator processing for a parametric speaker system | Electricity | 62 | Expired |
| US6393129B1 | Paper structures for speaker transducers | Electricity | 61 | Expired |
| US6389146B1 | Acoustically asymmetric bandpass loudspeaker with multiple acoustic filters | Electricity | 59 | Expired |
| US5772100A | Ultrasonic welder with dynamic nodal horn support | Performing Operations; Transporting | 56 | Expired |
| US4867370A | Apparatus and method for ultrasonic welding of wires | Performing Operations; Transporting | 47 | Expired |
| US6011855A | Piezoelectric film sonic emitter | Electricity | 47 | Expired |
| US4278093A | Interchangeable pacemaker connector for leads | Human Necessities | 46 | Expired |
| US5885129A | Directable sound and light toy | Human Necessities | 41 | Expired |
| US6151398A | Magnetic film ultrasonic emitter | Physics | 38 | Expired |
| US6535612B1 | Electroacoustic transducer with diaphragm securing structure and method | Electricity | 36 | Expired |
| US7162042B2 | Modulator processing for a parametric speaker system | Electricity | 35 | Expired |
| US6606389B1 | Piezoelectric film sonic emitter | Electricity | 34 | Expired |
| US5313663A | Ear mounted RF receiver | Electricity | 34 | Expired |
| US6577738B2 | Parametric virtual speaker and surround-sound system | Electricity | 33 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.