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For the Inventor, By the Inventor

Ibaraki, Japan

Koji Ishikawa

USPTO Granted Patents = 5


Average Co-Inventor Count = 4.1

ph-index = 4

Forward Citations = 54(Granted Patents)


Location History:

  • Ibaraki, JP (1995)
  • Tsuchiura, JP (1997)
  • Niihari-gun, JP (2009)
  • Kasumigaura, JP (2015)

Company Filing History:

goldMedal5 out of 1,504 
 
Hitachi Construction Machinery Co., Ltd.
 patents

Years Active: 1995-2015

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5 patents (USPTO):Explore Patents
1. 9212469 - Work machine (2015-12-15),
2. 7487609 - Hydraulic circuit device of hydraulic working machine (2009-02-10),
3. 5673558 - Hydraulic circuit system for hydraulic excavator (1997-10-07),
4. 5447027 - Hydraulic drive system for hydraulic working machines (1995-09-05),
5. 5421155 - Hydraulic drive system for hydraulic working machines (1995-06-06),
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