Inventor
Juichi Morikawa
Inventor
Katsuta, JP
Overview
Patents· 14 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer55%
C03CChemical composition of glasses, glazes or vitreous enamels5%
C22CAlloys5%
F16CShafts5%
G10LSpeech analysis techniques or speech synthesis5%
H01FMagnets5%
H04MTelephonic communication5%
H04NPictorial communication, e.g. television5%
H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers5%
H10NElectric solid-state devices not otherwise provided for5%
PatentTitleYear
5,825,853'Communication device'19985,717,818'Audio signal storing apparatus having a function for converting speech speed'19985,363,263'Coil assembly for rotary magnetic head apparatus'19945,193,045'Helical scan type magnetic recording and/or reproducing apparatus having combination type video head and flying erase head for low vibration'19935,126,906'Rotary magnetic head device with rotary transformer having high coupling coefficient'19925,057,944'Multiplex rotating magnetic head system for multiply recording and erasing audio and video signals'19914,961,122'Hydrodynamic grooved bearing device'19904,959,743'Jitter reducing tapered rotary drum for magnetic head apparatus'19904,833,562'Rotary magnetic head cylinder device for suppressing vibrations ofa magnetic tape'19894,803,338'Magnetic head having improved track width narrowing grooves'19894,794,483'Magnetic head having layers of amorphous magnetic alloy bonded together with a glass containing vandium oxide phosphorus oxide and antimony oxide'19884,745,507'Composite type magnetic head with non-magnetic member in coil mounting portion'19884,731,683'Magnetic recording and reproducing system with composite magnetic head'19884,223,292'Hall element'1980Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1980–1998Patents assigned to HITACHI LTD (14)· patent assignee history
1980–1998Based in Katsuta, JP· patent location history
1989Patents assigned to HITACHI VIDEO ENG (1)· patent assignee history
1998Based in Tottori, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 14 | 1980–1998 |
| HITACHI VIDEO ENG | 1 | 1989 |
Locations
| Location | Patents | Span |
|---|---|---|
| Katsuta, JP | 13 | 1980–1998 |
| Tottori, JP | 1 | 1998 |