Isao Yokoyama

Follow

Person

Himeji, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Method of counterflow through a pump and method of controlling the...
- Patent number 5,456,115
- Issue date Oct 10, 1995
- Hitachi, Ltd.
- Takao Kuwabara
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Method of controlling the operation of a pump in a pumping installa...
- Patent number 5,090,872
- Issue date Feb 25, 1992
- Hitachi Ltd.
- Takao Kuwabara
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Variable-speed pumped-storage power generating system
- Patent number 4,816,696
- Issue date Mar 28, 1989
- Hitachi, Ltd.
- Akihiro Sakayori
- F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...