Inventor

Hisashi Andoh

Inventor

Hitachi, JP

Overview

1988–2000

Patent span

Physics

Primary field (CPC G)

Patents· 16 as inventor

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

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer52%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%

G06KGraphical data reading9%

B22FWorking metallic powder4%

B41JTypewriters4%

C22CAlloys4%

G01PMeasuring linear or angular speed, acceleration, deceleration, or shock4%

G03GElectrography4%

H01HElectric switches4%

PatentTitleYear

RE036624'Optical recording media and information recording and reproducing units'2000 5,583,840'ROM type optical recording medium with a high reflectivity and an optical head operable on ROM, write-one and rewritable disk'1996 5,572,502'Optical disk apparatus'1996 5,484,686'Optical recording media and information recording and reproducing units'1996 5,475,656'Optical disk memory and information processing apparatus'1995 5,424,163'Picture recording method using a dispersant having coloring agent particles contained therein'1995 5,420,845'Methods of varying optical properties, optical devices, information recording media and information recording methods and apparatuses'1995 5,371,730'Optical memory and information processing apparatus'1994 5,353,642'Centrifugal type acceleration measuring device'1994 5,317,556'Information processing apparatus and optical head incorporated therein'1994 5,311,494'Optical disk apparatus and optical head'1994 5,274,612'Information processor and disk memory used in the same'1993 5,187,052'Optical recording medium'1993 4,907,015'Thermal printing head'1990 4,836,978'Method for making vacuum circuit breaker electrodes'1989 4,773,059'Information recording and reproducing apparatus having recording medium made of alloy which has at least two different crystalline structures in its solid state'1988

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1988–2000Patents assigned to HITACHI LTD (14)· patent assignee history

1988–2000Based in Hitachi, JP· patent location history

1990Based in Ibaraki, JP· patent location history

1994Patents assigned to KYOWA ELECTRONIC INSTR LTD (1)· patent assignee history

1994Based in Chofu, JP· patent location history

1995Patents assigned to SONY CORP (1)· patent assignee history

1995Based in Tochigi, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	14	1988–2000
KYOWA ELECTRONIC INSTR LTD	1	1994
SONY CORP	1	1995

Locations

Location	Patents	Span
Hitachi, JP	13	1988–2000
Tochigi, JP	1	1995
Chofu, JP	1	1994
Ibaraki, JP	1	1990