Inventor

Wasaburo Ohta

Inventor

Yokohama, JP

Overview

36→

Patents

1977–1995

Patent span

Physics

Primary field (CPC G)

Patents· 36 as inventor

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

C23Cprimary

C23CCoating metallic material18%

G03GElectrography15%

G01NInvestigating or analysing materials by determining their chemical or physical properties12%

H01JElectric discharge tubes or discharge lamps10%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein7%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%

Y10TTechnical subjects covered by former us classification7%

G11BInformation storage based on relative movement between record carrier and transducer5%

H04NPictorial communication, e.g. television3%

B05DProcesses for applying fluent materials to surfaces, in general2%

PatentTitleYear

5,465,475'Method of forming a thin film magnetic head'1995 5,427,668'Thin film deposition system'1995 5,368,908'Optical information recording medium'1994 5,251,202'Optical information recording medium having multi-layered structures for preventing undesired reflection and electric charging'1993 5,250,170'Gas sensor having metal-oxide semiconductor layer'1993 5,147,523'Thin film gas sensor'1992 5,133,849'Thin film forming apparatus'1992 5,114,559'Thin film deposition system'1992 5,112,466'Apparatus for forming a thin film'1992 5,058,527'Thin film forming apparatus'1991 5,019,885'Gas detecting device'1991 5,012,671'Gas detecting device'1991 5,003,812'Gas detecting device'1991 4,984,446'Gas detecting device and gas detecting system using the same'1991 4,982,696'Apparatus for forming thin film'1991 4,974,544'Vapor deposition apparatus'1990 4,967,589'Gas detecting device'1990 4,966,095'Apparatus for forming a thin film'1990 4,960,072'Apparatus for forming a thin film'1990 4,947,688'Flow velocity sensor'1990 4,876,984'Apparatus for forming a thin film'1989 4,854,265'Thin film forming apparatus'1989 4,818,074'Projection device for irradiating a light to a display device and optically magnifying and projecting a reflection light therefrom'1989 4,793,691'Liquid crystal color display device'1988 4,772,885'Liquid crystal color display device'1988 4,678,285'Liquid crystal color display device'1987 4,489,332'Information recording method and apparatus'1984 4,459,598'Image recording method'1984 4,268,157'Toner image transfer method and apparatus for electrostatic photography'1981 4,264,185'Two color electrostatographic apparatus'1981 4,242,434'Toner composition for multiple copy electrostatic photography'1980 4,172,722'Electrostatic copying method for forming multiple copies'1979 4,118,710'Electrostatic printing apparatus comprising improved printing electrode head'1978 4,084,899'Electrostatic copying machine'1978 4,060,441'Method for forming a transparent protective coating on a photograph or the like'1977 4,015,984'Inorganic photoconductor in glass binds with glass overcoat layer'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–1995Patents assigned to RICOH KK (35)· patent assignee history

1977–1981Based in Tokyo, JP· patent location history

1984–1995Based in Yokohama, JP· patent location history

1988–1995Based in Kanagawa, JP· patent location history

1990–1991Patents assigned to RICOH SEIKI CO LTD (2)· patent assignee history

1990Patents assigned to RICOH COMPANY CO (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
RICOH KK	35	1977–1995
RICOH SEIKI CO LTD	2	1990–1991
RICOH COMPANY CO	1	1990

Locations

Location	Patents	Span
Yokohama, JP	26	1984–1995
Tokyo, JP	8	1977–1981
Kanagawa, JP	2	1988–1995