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Hisao Shirasawa
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Kanagawa, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Color tone control device and image forming apparatus
Patent number
10,812,685
Issue date
Oct 20, 2020
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image reproducing apparatus
Patent number
8,115,836
Issue date
Feb 14, 2012
Ricoh Company, Ltd.
Seiji Miyahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image processing device and image processing method
Patent number
8,111,423
Issue date
Feb 7, 2012
Ricoh Company, Ltd.
Seiji Miyahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image processing method, image processing apparatus, computer progr...
Patent number
8,045,222
Issue date
Oct 25, 2011
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image output apparatus using close range radio contact wherein radi...
Patent number
7,962,658
Issue date
Jun 14, 2011
Ricoh Company, Ltd.
Yuichiro Kanoshima
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image processing apparatus, image processing method, and computer p...
Patent number
7,864,371
Issue date
Jan 4, 2011
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image processing apparatus and method thereof
Patent number
7,710,600
Issue date
May 4, 2010
Ricoh Company, Ltd.
Seiji Miyahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Color signal processing and color profile creation for color image...
Patent number
7,564,604
Issue date
Jul 21, 2009
Ricoh Company, Ltd.
Hisao Shirasawa
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Image output apparatus using close range radio contact wherein radi...
Patent number
7,454,528
Issue date
Nov 18, 2008
Ricoh Company, Ltd.
Yuichiro Kanoshima
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image processing method, image processing apparatus and recording m...
Patent number
7,362,896
Issue date
Apr 22, 2008
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Color converting device emphasizing a contrast of output color data...
Patent number
7,310,167
Issue date
Dec 18, 2007
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Color converting device emphasizing a contrast of output color data...
Patent number
7,072,084
Issue date
Jul 4, 2006
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Image processing method, image processing apparatus and recording m...
Patent number
6,839,460
Issue date
Jan 4, 2005
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Color image processing apparatus, color image forming method, and r...
Patent number
6,796,629
Issue date
Sep 28, 2004
Ricoh Company, Ltd.
Manabu Komatsu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Color conversion method for a color matching, a method for expandin...
Patent number
6,226,011
Issue date
May 1, 2001
Ricoh Company, Ltd.
Hiroyuki Sakuyama
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Color conversion processing method for color matching and a process...
Patent number
6,137,595
Issue date
Oct 24, 2000
Ricoh Company, Ltd.
Hiroyuki Sakuyama
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Image processing system for adaptive coding of color document images
Patent number
5,696,842
Issue date
Dec 9, 1997
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Background noise removing apparatus and method applicable to color...
Patent number
5,689,590
Issue date
Nov 18, 1997
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Method of coding two-dimensional data by fast cosine transform and...
Patent number
5,299,025
Issue date
Mar 29, 1994
Ricoh Company, Ltd.
Hisao Shirasawa
G06 - COMPUTING CALCULATING COUNTING
Patents Applications
last 30 patents
Information
Patent Application
COLOR TONE CONTROL DEVICE AND IMAGE FORMING APPARATUS
Publication number
20190268502
Publication date
Aug 29, 2019
RICOH COMPANY, LTD.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
COLOR PROFILE GENERATING APPARATUS, IMAGE PROCESSING APPARATUS, IMA...
Publication number
20140240340
Publication date
Aug 28, 2014
RICOH COMPANY, LTD.
Hisao SHIRASAWA
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
IMAGE PROCESSING DEVICE AND IMAGE PROCESSING METHOD
Publication number
20090122372
Publication date
May 14, 2009
RICOH COMPANY, LTD.
Seiji Miyahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image output apparatus using radio contact element
Publication number
20090051942
Publication date
Feb 26, 2009
Yuichiro Kanoshima
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND COMPUTER P...
Publication number
20080218779
Publication date
Sep 11, 2008
RICOH COMPANY, LTD.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image processing method, image processing apparatus, computer progr...
Publication number
20080007806
Publication date
Jan 10, 2008
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image processing apparatus and method thereof
Publication number
20070013927
Publication date
Jan 18, 2007
Seiji Miyahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Color converting device emphasizing a contrast of output color data...
Publication number
20060203270
Publication date
Sep 14, 2006
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image reproducing apparatus
Publication number
20060192878
Publication date
Aug 31, 2006
Seiji Miyahara
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image output apparatus using radio contact element
Publication number
20050200910
Publication date
Sep 15, 2005
Yuichiro Kanoshima
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Color signal processing and color profile creation for color image...
Publication number
20050140997
Publication date
Jun 30, 2005
Hisao Shirasawa
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Image processing method, image processing apparatus and recording m...
Publication number
20050089221
Publication date
Apr 28, 2005
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image processing apparatus, image processing method, and image proc...
Publication number
20040126009
Publication date
Jul 1, 2004
Hirokazu Takenaka
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Color image processing apparatus, color image forming method, and r...
Publication number
20040004644
Publication date
Jan 8, 2004
Ricoh Company, Ltd.
Manabu Komatsu
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Color converting device emphasizing a contrast of output color data...
Publication number
20020122193
Publication date
Sep 5, 2002
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Image processing method, image processing apparatus and recording m...
Publication number
20010052990
Publication date
Dec 20, 2001
Ricoh Company, Ltd.
Hisao Shirasawa
H04 - ELECTRIC COMMUNICATION TECHNIQUE