Inventor
MIYAKAWA SEIICHI
35 patents
⚠️ This page may combine multiple inventors who share the name “MIYAKAWA SEIICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
34 patentsUS4231561ANov 4, 1980
Auto document feeder for use with duplex copying machine
RICOH KK89 citations96
US4226525AOct 7, 1980
Electrostatic copying machine
RICOH KK51 citations96
US4215930AAug 5, 1980
Method of maintaining the correct conditions of an electrophotographically duplicated image
RICOH KK52 citations96
US4142165AFeb 27, 1979
Electrostatic copying machine comprising improved magnetic brush developing-cleaning unit
RICOH KK34 citations93
US5864737AJan 26, 1999
Image forming device which forms an electric field to discharge an object
RICOH KK33 citations92
US5666616ASep 9, 1997
Wet-type image forming apparatus for forming a condensed toner image
RICOH KK49 citations92
US4382420AMay 10, 1983
Development apparatus
RICOH KK42 citations92
US4310238AJan 12, 1982
Electrostatic copying apparatus
RICOH KK30 citations92
US4306804ADec 22, 1981
Exposure control and other component control for electrostatic copying machine
RICOH KK32 citations92
US4286543ASep 1, 1981
Apparatus for developing electrostatic image
RICOH KK43 citations92
US4194830AMar 25, 1980
Development apparatus
RICOH KK54 citations92
US4050806ASep 27, 1977
Method and apparatus for electrically biasing developing electrode of electrophotographic device
RICOH KK33 citations92
US4251152AFeb 17, 1981
Electrostatic apparatus for multi-image formation
RICOH KK21 citations82
US4218130AAug 19, 1980
Method for controlling a copying apparatus adapted to print images on opposite surfaces of a copy sheet
RICOH KK20 citations82
US4195260AMar 25, 1980
Apparatus for sensing deterioration of developing substance including ferromagnetic carrier and non-magnetic toner particles
RICOH KK25 citations82
US4166702ASep 4, 1979
Device for detecting a toner concentration in a developing solution
RICOH KK20 citations82
US5247334ASep 21, 1993
Image formation method and apparatus with preheating and pressure image transfer with liquid toner development
RICOH KK16 citations74
US4350749ASep 21, 1982
Reverse development method
RICOH KK16 citations74
US4210864AJul 1, 1980
Apparatus for sensing toner density using a stationary ferromagnetic mass within the toner to increase sensitivity
RICOH KK18 citations74
US5172180ADec 15, 1992
Image forming equipment with variable stepwise drive means operation
RICOH KK17 citations73
US4803593AFeb 7, 1989
Flat solid discharging device
RICOH KK14 citations73
US4669859AJun 2, 1987
Developing device
RICOH KK14 citations73
US4423134ADec 27, 1983
Developing unit for electrophotography
RICOH KK17 citations73
US4165172AAug 21, 1979
Drum cleaning system for electrophotographic apparatus
RICOH KK10 citations73
US4006709AFeb 8, 1977
Developing unit for electrophotography
RICOH KK9 citations73
US5521679AMay 28, 1996
Image forming apparatus having clamp for conveying a recording medium
RICOH KK11 citations72
US4168329ASep 18, 1979
Auto-bias developing process and an electrophotographic copying machine
RICOH KK11 citations71
US4139299AFeb 13, 1979
Auto-bias developing apparatus
RICOH KK5 citations63
US3980049ASep 14, 1976
Developing unit for electrophotography
RICOH KK3 citations63
US4129375ADec 12, 1978
Method and apparatus for electrically biasing developing electrode of electrophotography device
RICOH KK5 citations62
US4035071AJul 12, 1977
Developing process and apparatus for electrophotography
RICOH KK5 citations62
US5202534AApr 13, 1993
Developing apparatus using a liquid developer and having a system for cleaning the development region with a vacuum pressure
RICOH KK5 citations60
US4811158AMar 7, 1989
Solid state charger
RICOH KK3 citations56
US5264273ANov 23, 1993
Structure of a recording medium for an electrostatic recorder
RICOH KK0 citations51