Assignee
HITACHI SEIKO KK
JP·49 granted patents·1,494 citations·filing 1973–1999
Top patents by PatentIndex Score
49 records- 0195US4915550APressure foot of printed circuit board drilling apparatusHITACHI SEIKO KK·Filed 1988·Granted Apr 10, 1990·59 cites·11 claims
- 0292US5225660AConsumable-electrode ac gas shield arc welding method and apparatus thereforHITACHI SEIKO KK·Filed 1990·Granted Jul 6, 1993·74 cites·9 claims
- 0392US5010232AMethod of and apparatus for perforating printed circuit boardHITACHI SEIKO KK·Filed 1990·Granted Apr 23, 1991·70 cites·14 claims
- 0491US5349159AConsumable-electrode AC gas shield arc welding method and apparatus thereforHITACHI SEIKO KK·Filed 1993·Granted Sep 20, 1994·68 cites·4 claims
- 0590US4876433AInverter controlled-type power source for arc weldingHITACHI SEIKO KK·Filed 1988·Granted Oct 24, 1989·78 cites·7 claims
- 0690US4658494AApparatus for drilling printed circuit boardsHITACHI SEIKO KK·Filed 1986·Granted Apr 21, 1987·52 cites·10 claims
- 0790US4504722AFully automated machining apparatus optimization for electric discharge machining apparatusHITACHI SEIKO KK·Filed 1982·Granted Mar 12, 1985·26 cites·18 claims
- 0889US5086203AWire electric discharge machining apparatusHITACHI SEIKO KK·Filed 1989·Granted Feb 4, 1992·38 cites·9 claims
- 0988US5888036ADrill bit and step feeding methodHITACHI SEIKO KK·Filed 1997·Granted Mar 30, 1999·60 cites·9 claims
- 1088US5123789AMethod of and apparatus for machining printed circuit boardHITACHI SEIKO KK·Filed 1989·Granted Jun 23, 1992·62 cites·10 claims
- 1187US4527045AControl apparatus for an arc welderHITACHI SEIKO KK·Filed 1981·Granted Jul 2, 1985·55 cites·18 claims
- 1286US5315072APrinted wiring board having blind holesHITACHI SEIKO KK·Filed 1992·Granted May 24, 1994·61 cites·4 claims
- 1383US5332341APressure foot of printed circuit board drilling apparatusHITACHI SEIKO KK·Filed 1992·Granted Jul 26, 1994·46 cites·1 claims
- 1483US5266878ACNC apparatus for controlling a plurality of machinesHITACHI SEIKO KK·Filed 1991·Granted Nov 30, 1993·55 cites·7 claims
- 1582US4872787AMethod of drilling printed circuit boardHITACHI SEIKO KK·Filed 1987·Granted Oct 10, 1989·33 cites·20 claims
- 1681US5024562APressure foot for printed circuit board drilling machineHITACHI SEIKO KK·Filed 1990·Granted Jun 18, 1991·53 cites·15 claims
- 1781US4667113ATool failure detection apparatusHITACHI SEIKO KK·Filed 1985·Granted May 19, 1987·52 cites·5 claims
- 1879US5824991APulsed arc welding method and apparatusHITACHI SEIKO KK·Filed 1996·Granted Oct 20, 1998·43 cites·13 claims
- 1979US5087156APrinted circuit board boring machineHITACHI SEIKO KK·Filed 1990·Granted Feb 11, 1992·45 cites·11 claims
- 2079US5078558ALow mass spindle and Z-axis unitHITACHI SEIKO KK·Filed 1990·Granted Jan 7, 1992·38 cites·12 claims
- 2178US5111573ADevice and method of exchanging toolsHITACHI SEIKO KK·Filed 1991·Granted May 12, 1992·34 cites·7 claims
- 2276US6207927B1Gas-shielded AC arc welding method and machine making use of consumable electrodeHITACHI SEIKO KK·Filed 1999·Granted Mar 27, 2001·40 cites·9 claims
- 2372US5199830APrinted circuit board presser device in drilling machineHITACHI SEIKO KK·Filed 1990·Granted Apr 6, 1993·33 cites·7 claims
- 2471US5108236ALow mass spindle and z-axis unitHITACHI SEIKO KK·Filed 1990·Granted Apr 28, 1992·29 cites·12 claims
- 2568US4200390ACombined copying and printing apparatusHITACHI SEIKO KK·Filed 1978·Granted Apr 29, 1980·13 cites·8 claims
- 2664US5066171AMethod for drilling a printed circuit boardHITACHI SEIKO KK·Filed 1989·Granted Nov 19, 1991·15 cites·10 claims
- 2762US5876156APrinted-circuit board holding deviceHITACHI SEIKO KK·Filed 1996·Granted Mar 2, 1999·20 cites·5 claims
- 2859US5094574ASpot facing method and apparatus for printed circuit boardHITACHI SEIKO KK·Filed 1990·Granted Mar 10, 1992·23 cites·4 claims
- 2957US5090284AMechanisms for driving punch pins in punching apparatusHITACHI SEIKO KK·Filed 1989·Granted Feb 25, 1992·17 cites·1 claims
- 3056US5220715APrinted circuit board processing apparatusHITACHI SEIKO KK·Filed 1991·Granted Jun 22, 1993·14 cites·6 claims
- 3156US4982831APrinted circuit board adapter supplying apparatus and method for use in printed circuit board drilling apparatusHITACHI SEIKO KK·Filed 1989·Granted Jan 8, 1991·17 cites·4 claims
- 3253US4587765AMethod of an apparatus for grinding work surfaceHITACHI SEIKO KK·Filed 1984·Granted May 13, 1986·7 cites·10 claims
- 3353US4420685AMethod and equipment for detecting tool failureHITACHI SEIKO KK·Filed 1981·Granted Dec 13, 1983·15 cites·7 claims
- 3452US5109584APrinted circuit board adapter supplying apparatus and method for use in printed circuit board drilling apparatusHITACHI SEIKO KK·Filed 1990·Granted May 5, 1992·16 cites·4 claims
- 3551US4997319AApparatus for drilling a hole in a printed circuit boardHITACHI SEIKO KK·Filed 1989·Granted Mar 5, 1991·10 cites·7 claims
- 3650US5101546AApparatus for removing printed boardHITACHI SEIKO KK·Filed 1990·Granted Apr 7, 1992·13 cites·7 claims
- 3749US5205805APrinted circuit board processing machine incorporating tool holding deviceHITACHI SEIKO KK·Filed 1992·Granted Apr 27, 1993·14 cites·3 claims
- 3849US4867297ABoard exchanging apparatusHITACHI SEIKO KK·Filed 1987·Granted Sep 19, 1989·15 cites·7 claims
- 3946US4798920AStylus coordinate determining device with distortion compensationHITACHI SEIKO KK·Filed 1987·Granted Jan 17, 1989·15 cites·2 claims
- 4041US5756378AMethod of and apparatus for laser processingHITACHI SEIKO KK·Filed 1996·Granted May 26, 1998·9 cites·15 claims
- 4141US4966508AWork holding device for cutting printed boardsHITACHI SEIKO KK·Filed 1989·Granted Oct 30, 1990·9 cites·1 claims
- 4238US5200906AWire-cut electric discharge machining methodHITACHI SEIKO KK·Filed 1990·Granted Apr 6, 1993·10 cites·1 claims
- 4338US4983802ADrawing system in a wire-cut electrodischarge machineHITACHI SEIKO KK·Filed 1989·Granted Jan 8, 1991·5 cites·4 claims
- 4437US4968923AServo control systemHITACHI SEIKO KK·Filed 1989·Granted Nov 6, 1990·9 cites·2 claims
- 4536US5029097ATool detecting apparatusHITACHI SEIKO KK·Filed 1989·Granted Jul 2, 1991·6 cites·12 claims
- 4632US5115561AMethod of spot-facing printed circuit boardHITACHI SEIKO KK·Filed 1990·Granted May 26, 1992·4 cites·3 claims
- 4728US5064985AMethod for controlling withdrawal of electrode in electric-discharge machineHITACHI SEIKO KK·Filed 1989·Granted Nov 12, 1991·3 cites·4 claims
- 4828US4729108AApparatus for determining a coordinate of a given point on a tabletHITACHI SEIKO KK·Filed 1985·Granted Mar 1, 1988·8 cites·6 claims
- 4917US3944475AElectrolytic grinding methodHITACHI SEIKO KK·Filed 1973·Granted Mar 16, 1976·3 cites·5 claims
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