Inventor · disambiguated record
Shigeaki Wachi
Also filed as: SUZUKI T · WACHI SHIGEAKI · WACHI SHIGEAKI A
43 granted patents·1 pending application·835 citations·filing 1976–2009
98Inventor score
Files withSONY CORP43
Top patents by PatentIndex Score
44 records- 0199US4183079ADC-AC inverterSONY CORP·Filed 1978·Granted Jan 8, 1980·164 cites·8 claims
- 0297US4089049AInverter circuit including transformer with shielding of undesired radiationsSONY CORP·Filed 1976·Granted May 9, 1978·80 cites·1 claims
- 0391US4208706ASwitching regulatorSONY CORP·Filed 1978·Granted Jun 17, 1980·27 cites·7 claims
- 0489US5708649AOptical disk capable of storing information data at difference clock ratesSONY CORP·Filed 1996·Granted Jan 13, 1998·51 cites·7 claims
- 0588US4972398AOptical disk drive with servo loop for detecting defective disksSONY CORP·Filed 1988·Granted Nov 20, 1990·38 cites·12 claims
- 0688US4466089AInformation signal reproducing apparatusSONY CORP·Filed 1982·Granted Aug 14, 1984·31 cites·12 claims
- 0787US5379282ASystem for calculating focus servo control signal using focus error signal and reproduced RF signalSONY CORP·Filed 1992·Granted Jan 3, 1995·43 cites·3 claims
- 0885US6038207AOptical disk capable of inhibiting from rental useSONY CORP·Filed 1997·Granted Mar 14, 2000·44 cites·11 claims
- 0983US5170385ARecording medium with unembossed area indicating sector divisionsSONY CORP·Filed 1990·Granted Dec 8, 1992·34 cites·4 claims
- 1081US5079757AServo circuit for an optical disk information recording and reproducing apparatus with improved stability for tracking and focusing controlSONY CORP·Filed 1987·Granted Jan 7, 1992·28 cites·4 claims
- 1176US5537374AOptical recording medium and recording and/or reproducing apparatus using such optical recording mediumSONY CORP·Filed 1995·Granted Jul 16, 1996·23 cites·2 claims
- 1275US5640383AApparatus and method for reproducing data from a record mediumSONY CORP·Filed 1994·Granted Jun 17, 1997·18 cites·28 claims
- 1372US4820940AControl circuits operating with pulse-width modulated signalsSONY CORP·Filed 1987·Granted Apr 11, 1989·21 cites·4 claims
- 1472US4543650AServo system including velocity and phase servo circuits for digital audio record disc reproducing apparatusSONY CORP·Filed 1982·Granted Sep 24, 1985·16 cites·19 claims
- 1571US7828620B2Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unitSONY CORP·Filed 2004·Granted Nov 9, 2010·9 cites·36 claims
- 1670US7892063B2Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing recording apparatus and recording apparatus, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unitSONY CORP·Filed 2009·Granted Feb 22, 2011·1 cites·29 claims
- 1767US4091434ASurge current protection circuitSONY CORP·Filed 1976·Granted May 23, 1978·17 cites·9 claims
- 1864US4539666AApparatus for controlling rotation of a record disk at a constant linear velocitySONY CORP·Filed 1982·Granted Sep 3, 1985·12 cites·12 claims
- 1964US4047089AStarting circuit for inverterSONY CORP·Filed 1976·Granted Sep 6, 1977·13 cites·9 claims
- 2063US5224086ASpindle servo system for magneto-optical recording/playback apparatusSONY CORP·Filed 1991·Granted Jun 29, 1993·14 cites·7 claims
- 2161US4647828AServo systemSONY CORP·Filed 1985·Granted Mar 3, 1987·12 cites·11 claims
- 2259US5504727AOptical recording medium and recording and/or reproducing apparatus using such optical recording mediumSONY CORP·Filed 1994·Granted Apr 2, 1996·9 cites·5 claims
- 2359US5471447ASeek control for information storage disc driveSONY CORP·Filed 1991·Granted Nov 28, 1995·11 cites·4 claims
- 2459US5224085AOptical recording and reproducing apparatus that cancels recording or erase mode if focus or tracking is improperSONY CORP·Filed 1990·Granted Jun 29, 1993·12 cites·6 claims
- 2555US5148424ADetrack detecting system in an optical recording/reproducing apparatusSONY CORP·Filed 1990·Granted Sep 15, 1992·10 cites·8 claims
- 2655US5056072ASeek apparatus for optical disc driveSONY CORP·Filed 1988·Granted Oct 8, 1991·9 cites·5 claims
- 2753US5487056AOptical recording medium and recording and/or reproducing apparatus using such optical recording mediumSONY CORP·Filed 1995·Granted Jan 23, 1996·8 cites·2 claims
- 2852US5003523AApparatus for recording and reproducing information on an optical disk with a focus servo system for avoiding influence of traverse signal during searchSONY CORP·Filed 1988·Granted Mar 26, 1991·8 cites·24 claims
- 2950US5712836AApparatus and method for adjusting a rotational velocity of a disk storage medium with measuring the amount of time to reproduce address data stored thereonSONY CORP·Filed 1996·Granted Jan 27, 1998·7 cites·6 claims
- 3048US5970026ATemperature invariant, magneto-optic modulator coil driving circuitSONY CORP·Filed 1993·Granted Oct 19, 1999·7 cites·5 claims
- 3148US4126891ASwitching regulator with feedback system for regulating output currentSONY CORP·Filed 1976·Granted Nov 21, 1978·4 cites·7 claims
- 3246US5471444ASeek circuit for optical discSONY CORP·Filed 1994·Granted Nov 28, 1995·6 cites·5 claims
- 3346US5138595AServo control circuit for optical disc apparatusSONY CORP·Filed 1989·Granted Aug 11, 1992·6 cites·20 claims
- 3446US5121016ALinear motorSONY CORP·Filed 1991·Granted Jun 9, 1992·14 cites·4 claims
- 3543US4039921AInverter radiation suppressionSONY CORP·Filed 1976·Granted Aug 2, 1977·6 cites·10 claims
- 3642US5168484AMagnetic head lifting device for magneto-optical recording/reproducing apparatus including drive means responsive to a PLL circuitSONY CORP·Filed 1991·Granted Dec 1, 1992·5 cites·2 claims
- 3742US2005077172A1Electrochemical device and gas storage apparatusFiled 2003·Application pending·0 cites
- 3840US5015932AActuator driving circuitsSONY CORP·Filed 1990·Granted May 14, 1991·4 cites·9 claims
- 3940US4896310ALight beam control arrangements for optical disc apparatusSONY CORP·Filed 1988·Granted Jan 23, 1990·4 cites·9 claims
- 4036US4031454ATransistor inverterSONY CORP·Filed 1976·Granted Jun 21, 1977·3 cites·8 claims
- 4134US4951272ASystem and method for accessing tracks for optical disc apparatusSONY CORP·Filed 1988·Granted Aug 21, 1990·2 cites·8 claims
- 4233US4551661ADriving apparatus for a recording mediumSONY CORP·Filed 1983·Granted Nov 5, 1985·2 cites·5 claims
- 4332US4135237AInverterSONY CORP·Filed 1977·Granted Jan 16, 1979·1 cites·17 claims
- 4431US4652799AApparatus for driving a recording medium at a constant speed relative to a pickup deviceSONY CORP·Filed 1985·Granted Mar 24, 1987·1 cites·5 claims
Join the waitlist — get patent alerts
Get an alert when Shigeaki Wachi files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →