Copal Company Limited

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
G03B APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR 295
 
  
 
B32B LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM1156
 
  
 
F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR 1109
 
  
 
G01B MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS198
 
  
 
G01D MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR 159
 
  
 
G06K RECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS 1197
 
  
 
H01S DEVICES USING STIMULATED EMISSION191
 
  
 
H03M CODING, DECODING OR CODE CONVERSION, IN GENERAL 1110

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
6001465 Light shielding blade for camera made of para-orientation aromatic polyamide filmMay 01, 98Dec 14, 99[B32B]
5775791 Surface emission apparatusApr 27, 95Jul 07, 98[F21V]
D388123 Light-emitting diode indicatorOct 30, 95Dec 23, 97[2001]
5699058 Absolute encoder generating phase-shifted triangular waveforms to produce multi-bit signalsMar 13, 95Dec 16, 97[H03M]
5539519 Compact, high resolution optical displacement detectorAug 11, 92Jul 23, 96[G01B]
5438193 Absolute rotary encoder with slit patterns having bit-coded tracks ranging from higher to lower orderDec 15, 93Aug 01, 95[G01D]
5343029 Optical scanner having laser diode as light sourceApr 24, 92Aug 30, 94[G06K]
5315335 Brake device for focal plane shutterJul 30, 92May 24, 94[G03B]
5172152 Focal plane shutterJun 28, 91Dec 15, 92[G03B]
5163063 Semiconductor laser driving circuitFeb 04, 91Nov 10, 92[H01S]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6131840 Mechanism for preventing uneven take-up of tapeExpiredNov 01, 94Oct 17, 00[G03B]
6070482 Gear moduleExpiredApr 17, 98Jun 06, 00[F16H]
5943119 Photographic developing/printing apparatusExpiredOct 24, 97Aug 24, 99[G03B]
5917796 Magneto-optical disk apparatus having an ejector arm and magnetic field generating means mounted on a stationary baseExpiredJun 03, 97Jun 29, 99[G11B]
5848844 Fluid bearingExpiredJun 10, 97Dec 15, 98[F16C]
5809676 Sign display apparatusExpiredApr 25, 96Sep 22, 98[G09F]
5771217 Magneto-optical disk apparatus having a ejector arm and magnetic field generating means mounted on a stationary baseExpiredMar 03, 95Jun 23, 98[G11B]
5669030 Film feeder for automatic developing machineExpiredDec 27, 95Sep 16, 97[G05D, G03D]
5600392 Position sensorExpiredOct 06, 94Feb 04, 97[G03B]
5525955 Capacitor coupled potentiometerExpiredMar 30, 94Jun 11, 96[H01C]
5508773 Focal plane shutter for use in a photographic cameraExpiredNov 18, 94Apr 16, 96[G03B]
5446514 Shutter blades drive mechanism for photographic camerasExpiredJan 04, 94Aug 29, 95[G03B]
5408459 Opening/closing door mechanism for a recording/reproducing apparatusExpiredJun 28, 93Apr 18, 95[G11B]
5402283 Recording medium cartridge handling mechanism in library apparatusExpiredMay 11, 93Mar 28, 95[G11B]
5323118 Hinged displacement sensorExpiredNov 10, 92Jun 21, 94[G01R]
5287140 Control unit for a program shutterExpiredApr 28, 92Feb 15, 94[G03B]
5258797 Camera shutter device incorporated with lens shifting mechanismExpiredJul 02, 92Nov 02, 93[G03B]
5253526 Capacitive acceleration sensor with free diaphragmExpiredMay 22, 91Oct 19, 93[G01P]
5255037 Shutter blade opening and closing deviceExpiredSep 05, 91Oct 19, 93[G03B]
5241417 Multi-layered optical filter film and production method thereofExpiredFeb 04, 91Aug 31, 93[G02B]

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