Kotaro Naya

Person

Ebina, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Screw-type rotary fluid machine including rotors having treated sur...
- Patent number 5,314,321
- Issue date May 24, 1994
- Hitachi, Ltd.
- Akihiko Yamamoto
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Method of treating surfaces of rotors of the screw type rotary machine
- Patent number 5,223,052
- Issue date Jun 29, 1993
- Hitachi, Ltd.
- Akihiko Yamamoto
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Vacuum pump apparatus and shaft sealing device therefor
- Patent number 4,993,930
- Issue date Feb 19, 1991
- Hitachi, Ltd.
- Riichi Uchida
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Vacuum evacuation system
- Patent number 4,797,068
- Issue date Jan 10, 1989
- Hitachi, Ltd.
- Tadashi Hayakawa
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Two-stage vacuum pump apparatus and method of operating the same
- Patent number 4,770,609
- Issue date Sep 13, 1988
- Hitachi, Ltd.
- Riichi Uchida
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Screw type vacuum pump
- Patent number 4,714,418
- Issue date Dec 22, 1987
- Hitachi, Ltd.
- Katsumi Matsubara
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...

Kotaro Naya

Person

Patents Grantslast 30 patents

Screw-type rotary fluid machine including rotors having treated sur...

Method of treating surfaces of rotors of the screw type rotary machine

Vacuum pump apparatus and shaft sealing device therefor

Vacuum evacuation system

Two-stage vacuum pump apparatus and method of operating the same

Screw type vacuum pump