Inventor

Seiichi Miyakawa

Inventor

Nagareyama, JP

Overview

37→

Patents

1976–1999

Patent span

Physics

Primary field (CPC G)

Patents· 37 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G03Gprimary

G03GElectrography67%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests18%

H01TSpark gaps4%

B41JTypewriters2%

G01NInvestigating or analysing materials by determining their chemical or physical properties2%

G03BApparatus or arrangements for taking photographs or for projecting or viewing them2%

G06KGraphical data reading2%

H04NPictorial communication, e.g. television2%

Y10TTechnical subjects covered by former us classification2%

PatentTitleYear

5,864,737'Image forming device which forms an electric field to discharge an object'1999 5,666,616'Wet-type image forming apparatus for forming a condensed toner image'1997 5,521,679'Image forming apparatus having clamp for conveying a recording medium'1996 5,264,273'Structure of a recording medium for an electrostatic recorder'1993 5,247,334'Image formation method and apparatus with preheating and pressure image transfer with liquid toner development'1993 5,202,534'Developing apparatus using a liquid developer and having a system for cleaning the development region with a vacuum pressure'1993 5,172,180'Image forming equipment with variable stepwise drive means operation'1992 4,811,158'Solid state charger'1989 4,803,593'Flat solid discharging device'1989 4,669,859'Developing device'1987 4,640,129'Method and apparatus for detecting toner concentration of two-component dry developer'1987 RE032330'Method of maintaining the correct conditions of an electrophotographically duplicated image'1987 RE031707'Method and apparatus for electrically biasing developing electrode of electrophotographic device'1984 4,423,134'Developing unit for electrophotography'1983 4,382,420'Development apparatus'1983 4,350,749'Reverse development method'1982 4,310,238'Electrostatic copying apparatus'1982 4,306,804'Exposure control and other component control for electrostatic copying machine'1981 4,286,543'Apparatus for developing electrostatic image'1981 4,251,152'Electrostatic apparatus for multi-image formation'1981 4,231,561'Auto document feeder for use with duplex copying machine'1980 4,226,525'Electrostatic copying machine'1980 4,218,130'Method for controlling a copying apparatus adapted to print images on opposite surfaces of a copy sheet'1980 4,215,930'Method of maintaining the correct conditions of an electrophotographically duplicated image'1980 4,210,864'Apparatus for sensing toner density using a stationary ferromagnetic mass within the toner to increase sensitivity'1980 4,194,830'Development apparatus'1980 4,195,260'Apparatus for sensing deterioration of developing substance including ferromagnetic carrier and non-magnetic toner particles'1980 4,168,329'Auto-bias developing process and an electrophotographic copying machine'1979 4,166,702'Device for detecting a toner concentration in a developing solution'1979 4,165,172'Drum cleaning system for electrophotographic apparatus'1979 4,142,165'Electrostatic copying machine comprising improved magnetic brush developing-cleaning unit'1979 4,139,299'Auto-bias developing apparatus'1979 4,129,375'Method and apparatus for electrically biasing developing electrode of electrophotography device'1978 4,050,806'Method and apparatus for electrically biasing developing electrode of electrophotographic device'1977 4,035,071'Developing process and apparatus for electrophotography'1977 4,006,709'Developing unit for electrophotography'1977 3,980,049'Developing unit for electrophotography'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–1999Patents assigned to RICOH KK (34)· patent assignee history

1976–1999Based in Nagareyama, JP· patent location history

1977–1987Based in Tokyo, JP· patent location history

1987Patents assigned to MIYAKAWA SEIICHI (1)· patent assignee history

1987Patents assigned to SAKAMOTO KOJI (1)· patent assignee history

1987Patents assigned to TATSUMI SUSUMU (1)· patent assignee history

1989Patents assigned to NORITAKE CO LTD (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
RICOH KK	34	1976–1999
MIYAKAWA SEIICHIself	1	1987
NORITAKE CO LTD	1	1989
SAKAMOTO KOJI	1	1987
TATSUMI SUSUMU	1	1987

Locations

Location	Patents	Span
Nagareyama, JP	26	1976–1999
Tokyo, JP	11	1977–1987