Inventor
Kenji Kawakami
Inventor
Tokyo, JP
Overview
Patents· 36 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 transducer19%
H03DDemodulation or transference of modulation from one carrier to another9%
G01RMeasuring electric variables7%
H03HImpedance networks, e.g. resonant circuits7%
H03BGeneration of oscillations, directly or by frequency-changing, by circuits employing active elements which operate in a non-switching manner5%
Y10TTechnical subjects covered by former us classification5%
D02JFinishing or dressing of filaments, yarns, threads, cords, ropes or the like4%
G01SRadio direction-finding4%
G03GElectrography4%
H04LTransmission of digital information, e.g. telegraphic communication4%
PatentTitleYear
9,385,900'Signal transmission system'20168,907,704'Frequency synthesizer'20148,798,220'Signal source synchronization circuit'20148,548,416'Semiconductor chip and radio frequency circuit'20138,308,887'Via hole forming method using electrophotographic printing method'20128,229,387'Even harmonic mixer'20128,206,997'Method of manufacturing a semiconductor integrated circuit device and a method of manufacturing a thin film probe sheet for using the same'20128,062,911'Method of manufacturing a semiconductor integrated circuit device and a method of manufacturing a thin film probe sheet for using the same'20118,018,290'Oscillator, transmitter-receiver and frequency synthesizer'20118,012,287'Via hole forming method using electrophotographic printing method'20117,675,376'Voltage-controlled oscillator'20107,675,383'Switch circuit'20107,327,991'Pulse modulation circuit'20087,018,857'Method of manufacturing a semiconductor device including defect inspection using a semiconductor testing probe'20066,362,777'Pulse-doppler radar apparatus'20025,835,317'Cleaning device for magnetic tape recording and/or reproducing apparatus'19985,787,126'Detector and receiving and transmitting apparatus'19985,717,366'Ladder type piezoelectric filter including conductive rubber plates'19985,528,893'Method for heat treating a synthetic yarn during false-twist texturing and a method for rethreading a yarn'1996RE034927'Magnetic tape cassette with tape protective closure and lock mechanism'19955,404,705'Apparatus for heat treating a synthetic yarn during false-twist texturing'19955,332,982'Ladder-type electric filter device'19945,218,156'Apparatus for combining stored waveforms to synthesize musical tones'19935,141,811'Elastic synthetic polymer filament with multi-lobated cross-sectional profile'19925,057,802'Ladder-type electric filter apparatus and housing therefor'19914,961,120'Recording and/or reproducing apparatus with rotary head for magnetic tape cassette'19904,881,137'Magnetic tape cassette with tape protective closure and lock mechanism'19894,843,510'Magnetic tape cassette with tape protective closure and lock mechanism'19894,816,953'Tape cassette with groove engageable with loading hook'19894,740,849'Guide arrangements for maintaining magnetic tape in proper position relative to a head'19884,694,360'Tape cassette with concave engagement portion and player with hook engageable therewith'19874,644,433'Magnetic tape cassette having integrated optical elements'19874,625,253'Magnetic tape cassette'19864,572,461'Magnetic tape cassette'19864,161,678'Servo-system'19794,074,274'Multipoint recorder'1978Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1986–1998Patents assigned to SONY CORP (11)· patent assignee history
1986–1998Based in Kanagawa, JP· patent location history
1991–1998Patents assigned to NGK SPARK PLUG CO (3)· patent assignee history
1991–1998Based in Nagoya, JP· patent location history
1992–1996Patents assigned to TEIJIN LTD (3)· patent assignee history
1992–1996Based in Matsuyama, JP· patent location history
1995–2016Based in Tokyo, JP· patent location history
1998–2016Patents assigned to MITSUBISHI ELECTRIC CORP (10)· patent assignee history
2011–2016Patents assigned to KAWAKAMI KENJI (6)· patent assignee history
2011–2012Based in Nanjyo, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| SONY CORP | 11 | 1986–1998 |
| MITSUBISHI ELECTRIC CORP | 10 | 1998–2016 |
| KAWAKAMI KENJIself | 6 | 2011–2016 |
| NGK SPARK PLUG CO | 3 | 1991–1998 |
| TEIJIN LTD | 3 | 1992–1996 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 13 | 1995–2016 |
| Kanagawa, JP | 10 | 1986–1998 |
| Nagoya, JP | 3 | 1991–1998 |
| Matsuyama, JP | 3 | 1992–1996 |
| Nanjyo, JP | 2 | 2011–2012 |