Inventor
Nathan A. Johanningsmeier
Inventor
San Jose, CA, US
Overview
Patents· 21 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H04Rprimary
H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers47%
H03FAmplifiers12%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems9%
G06FElectric digital data processing6%
G01DMeasuring not specially adapted for a specific variable3%
G01KMeasuring temperature3%
G01RMeasuring electric variables3%
G01SRadio direction-finding3%
H01RElectrically-conductive connections3%
H02JElectric power networks3%
PatentTitleYear
10,963,410Data bus driver with electrical energy dump202110,666,209Increased output impedance switching amplifier and low-side recycle mode202010,283,989Electrical power converter and detachable energy storage reservoir201910,254,134Interference-insensitive capacitive displacement sensing201910,212,500Digital transducer circuit201910,146,732Time-division multiplexed data bus interface20189,967,664Sensor assembly for measuring diaphragm displacement and temperature in a micro speaker20189,854,355Grounding circuit for alternate audio plug designs20179,847,713Charge pump-based split-rail supply generation20179,793,658'Reuse of plug detection contacts to reduce crosstalk'20179,729,964'Audio apparatus having dynamic ground break resistance'20179,699,558'Creation of sub-sample delays in digital audio'20179,654,863'Main logic board with mounted speaker and integrated acoustic cavity'20179,332,343'Multi-channel audio system having a shared current sense element for estimating individual speaker impedances using test signals'20169,263,992'Class D amplifier with variable switching frequency'20169,247,345'Multi-channel audio system having a shared current sense element for estimating individual speaker impedances'20169,231,543'Audio power amplification with reduced input power supply crest factor'20169,148,718'Grounding circuit for alternate audio plug designs'20159,099,967'Increasing ground noise rejection in audio systems'20158,942,410'Magnetically biased electromagnet for audio applications'20158,644,519'Electronic devices with improved audio'2014Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
2014–2021Patents assigned to APPLE INC (21)· patent assignee history
2014Patents assigned to CULBERT DANIEL (1)· patent assignee history
2014Patents assigned to GOEL RUCHI (1)· patent assignee history
2014Patents assigned to ISAAC RONALD NADIM (1)· patent assignee history
2014–2021Based in San Jose, CA, US· patent location history
2015Patents assigned to BREECE III DAVID C (1)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| APPLE INC | 21 | 2014–2021 |
| BREECE III DAVID C | 1 | 2015 |
| CULBERT DANIEL | 1 | 2014 |
| GOEL RUCHI | 1 | 2014 |
| ISAAC RONALD NADIM | 1 | 2014 |
Locations
| Location | Patents | Span |
|---|---|---|
| San Jose, California, US | 21 | 2014–2021 |