Inventor
Keijiro Maeda
Inventor
Yokohama, JP
Overview
Patents· 5 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 transducers60%
G11BInformation storage based on relative movement between record carrier and transducer40%
PatentTitleYear
5,471,540'Electrostatic loudspeaker having stationary electrodes formed as multiple sheets insulated from each other'19954,322,583'Voice coil bobbin connection to loudspeaker diaphragm of honeycomb core sandwiched by sheets'19824,176,249'Deleterious mechanical vibrations from dynamic loudspeaker offset by additional dynamic device'19794,054,291'Turntable assembly for phonograph records'19774,029,322'Pickup arm assembly'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1995Patents assigned to SONY CORP (5)· patent assignee history
1977–1982Based in Yokohama, JP· patent location history
1995Based in Kanagawa, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SONY CORP | 5 | 1977–1995 |
Locations
| Location | Patents | Span |
|---|---|---|
| Yokohama, JP | 4 | 1977–1982 |
| Kanagawa, JP | 1 | 1995 |