Inventor

Kazuyoshi Tokunaga

Inventor

Katsuta, JP

Overview

1982–2008

Patent span

Physics

Primary field (CPC G)

Patents· 13 as inventor

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

B04Bprimary

B04BCentrifuges29%

G03GElectrography29%

G06FElectric digital data processing14%

H04NPictorial communication, e.g. television14%

B41JTypewriters7%

G06KGraphical data reading7%

PatentTitleYear

7,433,075'Method and image forming apparatus, and printing system for recording invisible information recording'2008 7,209,256'Document processing method'2007 6,679,821'Centrifugal separator and administration of user and actual operation of the same'2004 6,567,180'Document printing method'2003 5,841,548'Printing apparatus for reproducing copy sets containing variable pages and a sorting means for separating the different copy sets'1998 5,762,598'Simulation program for centrifugation using a fixed-angle rotor'1998 5,675,519'Apparatus and method for controlling centrifugal separator and centrifugation simulation method and centrifugal separator'1997 5,342,280'System for management of body rotation of centrifuge'1994 4,672,398'Ink droplet expelling apparatus'1987 4,427,755'Method for transferring toner images in electrophotography'1984 4,416,533'Nonimpact printer'1983 4,374,191'Dry reversal developer for electrostatic photography and electrostatic photographic method using the same'1983 4,314,257'Thermomagnetic recording apparatus'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982–1987Patents assigned to HITACHI LTD (5)· patent assignee history

1982–2008Based in Ibaraki, JP· patent location history

1983–2004Patents assigned to HITACHI KOKI KK (9)· patent assignee history

1983–1997Based in Katsuta, JP· patent location history

1998–2004Based in Hitachinaka, JP· patent location history

2007–2008Patents assigned to RICOH PRINTING SYS LTD (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI KOKI KK	9	1983–2004
HITACHI LTD	5	1982–1987
RICOH PRINTING SYS LTD	2	2007–2008

Locations

Location	Patents	Span
Katsuta, JP	6	1983–1997
Ibaraki, JP	5	1982–2008
Hitachinaka, JP	2	1998–2004