Assignee
COPAL CO LTD
JP·188 granted patents·2,484 citations·filing 1973–2001
Top patents by PatentIndex Score
188 records- 0196US5775791ASurface emission apparatusCOPAL CO LTD·Filed 1993·Granted Jul 7, 1998·200 cites·6 claims
- 0294US4984474ATorque sensorCOPAL CO LTD·Filed 1989·Granted Jan 15, 1991·111 cites·15 claims
- 0394US4059916ALight diffusing deviceCOPAL CO LTD·Filed 1976·Granted Nov 29, 1977·144 cites·20 claims
- 0492US4470873AMethod of manufacturing magnetic sensor comprising at least two magnetoresistive elementsCOPAL CO LTD·Filed 1983·Granted Sep 11, 1984·45 cites·18 claims
- 0592US4425557ANon-contact magnetic potentiometerCOPAL CO LTD·Filed 1982·Granted Jan 10, 1984·42 cites·12 claims
- 0692US4141058ALight diffusing deviceCOPAL CO LTD·Filed 1977·Granted Feb 20, 1979·112 cites·11 claims
- 0790US5073710AOptical displacement detector including a displacement member's surface having a diffractive pattern and a holographic lens patternCOPAL CO LTD·Filed 1990·Granted Dec 17, 1991·68 cites·19 claims
- 0890US4395695ANon-contact magnetic potentiometerCOPAL CO LTD·Filed 1981·Granted Jul 26, 1983·34 cites·5 claims
- 0987US4616281ADisplacement detecting apparatus comprising magnetoresistive elementsCOPAL CO LTD·Filed 1983·Granted Oct 7, 1986·38 cites·14 claims
- 1087US4190344ADriving circuit for camera shuttersCOPAL CO LTD·Filed 1977·Granted Feb 26, 1980·18 cites·2 claims
- 1185US5163063ASemiconductor laser driving circuitCOPAL CO LTD·Filed 1991·Granted Nov 10, 1992·100 cites·25 claims
- 1285US4173420APaper feeding mechanism in a printerCOPAL CO LTD·Filed 1978·Granted Nov 6, 1979·27 cites·3 claims
- 1384US3978496AAutomatic flash-photographing arrangementCOPAL CO LTD·Filed 1975·Granted Aug 31, 1976·14 cites·5 claims
- 1483US4603365AMagnetic detection apparatusCOPAL CO LTD·Filed 1983·Granted Jul 29, 1986·38 cites·16 claims
- 1582US4664493APhotographic shutterCOPAL CO LTD·Filed 1985·Granted May 12, 1987·20 cites·16 claims
- 1681US6065936AAxial fan, method of manufacturing impeller for axial fan, and mold for manufacturing impeller for axial fanCOPAL CO LTD·Filed 1998·Granted May 23, 2000·50 cites·10 claims
- 1781US5539519ACompact, high resolution optical displacement detectorCOPAL CO LTD·Filed 1992·Granted Jul 23, 1996·41 cites·8 claims
- 1881US3999196APhotographic cameraCOPAL CO LTD·Filed 1975·Granted Dec 21, 1976·12 cites·4 claims
- 1980US4975722AFocal plane shutterCOPAL CO LTD·Filed 1990·Granted Dec 4, 1990·23 cites·12 claims
- 2080US4211498APaper cutting and perforated line forming device of printerCOPAL CO LTD·Filed 1979·Granted Jul 8, 1980·34 cites·7 claims
- 2179US5255037AShutter blade opening and closing deviceCOPAL CO LTD·Filed 1991·Granted Oct 19, 1993·20 cites·18 claims
- 2279US3947855AElectric shutter means with battery checking circuitCOPAL CO LTD·Filed 1975·Granted Mar 30, 1976·11 cites·3 claims
- 2377US5253526ACapacitive acceleration sensor with free diaphragmCOPAL CO LTD·Filed 1991·Granted Oct 19, 1993·37 cites·12 claims
- 2477US4609275AExposure control unitCOPAL CO LTD·Filed 1985·Granted Sep 2, 1986·15 cites·4 claims
- 2576US4109266ABraking mechanism for focal plane shuttersCOPAL CO LTD·Filed 1977·Granted Aug 22, 1978·9 cites·6 claims
- 2675US5241417AMulti-layered optical filter film and production method thereofCOPAL CO LTD·Filed 1991·Granted Aug 31, 1993·51 cites·8 claims
- 2775US4984003ADevice for opening and closing shutter blade without bounceCOPAL CO LTD·Filed 1989·Granted Jan 8, 1991·15 cites·7 claims
- 2875US4396281ANegative film carrier deviceCOPAL CO LTD·Filed 1982·Granted Aug 2, 1983·12 cites·3 claims
- 2975US4231650ABlade type focal plane shutterCOPAL CO LTD·Filed 1978·Granted Nov 4, 1980·9 cites·8 claims
- 3075US4013159APrinter having a limited movement platen and/or printing head and independent supports thereforCOPAL CO LTD·Filed 1975·Granted Mar 22, 1977·17 cites·5 claims
- 3174US5408459AOpening/closing door mechanism for a recording/reproducing apparatusCOPAL CO LTD·Filed 1993·Granted Apr 18, 1995·33 cites·12 claims
- 3274US4514064AElectromagnetic shutterCOPAL CO LTD·Filed 1982·Granted Apr 30, 1985·12 cites·20 claims
- 3374US4492457AColor correcting device for color printing light sourceCOPAL CO LTD·Filed 1982·Granted Jan 8, 1985·15 cites·2 claims
- 3473US4429988APrinted paper feeding device for photograph processing apparatusCOPAL CO LTD·Filed 1982·Granted Feb 7, 1984·26 cites·4 claims
- 3572USD388123SLight-emitting diode indicatorCOPAL CO LTD·Filed 1995·Granted Dec 23, 1997·21 cites·1 claims
- 3672US4811137ADisk cartridge shutter opening and closing mechanismCOPAL CO LTD·Filed 1987·Granted Mar 7, 1989·20 cites·21 claims
- 3772US4348125APaper guide mechanism of printerCOPAL CO LTD·Filed 1980·Granted Sep 7, 1982·25 cites·7 claims
- 3872US4123679ACoreless cylindrical armature for electrical rotary machinesCOPAL CO LTD·Filed 1977·Granted Oct 31, 1978·28 cites·20 claims
- 3971US4462672AControl circuit for an electromagnetically driven programming shutterCOPAL CO LTD·Filed 1983·Granted Jul 31, 1984·10 cites·13 claims
- 4071US4346972ACamera equipped with an automatically controlling device for focusing and shutter operationCOPAL CO LTD·Filed 1981·Granted Aug 31, 1982·11 cites·7 claims
- 4171US4312597APrinterCOPAL CO LTD·Filed 1978·Granted Jan 26, 1982·14 cites·3 claims
- 4271US4302091ABound preventing device for focal plane shuttersCOPAL CO LTD·Filed 1979·Granted Nov 24, 1981·8 cites·7 claims
- 4371US4192595AElectroflash controlling circuit including a delay circuit for electrically controlled focal plane shuttersCOPAL CO LTD·Filed 1978·Granted Mar 11, 1980·8 cites·4 claims
- 4470US5258797ACamera shutter device incorporated with lens shifting mechanismCOPAL CO LTD·Filed 1992·Granted Nov 2, 1993·18 cites·4 claims
- 4570US4250780ACutter blade receiving member in a printerCOPAL CO LTD·Filed 1978·Granted Feb 17, 1981·14 cites·3 claims
- 4670US4245323AElectronic calculator with time display functionCOPAL CO LTD·Filed 1979·Granted Jan 13, 1981·17 cites·5 claims
- 4769US4104967ALine printerCOPAL CO LTD·Filed 1977·Granted Aug 8, 1978·14 cites·9 claims
- 4868US6126395AAxial fanCOPAL CO LTD·Filed 1999·Granted Oct 3, 2000·26 cites·11 claims
- 4968US4494846AElectromagnetic shutterCOPAL CO LTD·Filed 1982·Granted Jan 22, 1985·9 cites·12 claims
- 5068US4293236APrinterCOPAL CO LTD·Filed 1979·Granted Oct 6, 1981·13 cites·11 claims
Showing the top 50 of 188 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when COPAL CO LTD files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →