Nabtesco Automotive Corporation

Sankyo Company, Limited

Yoshihiro Mitsuhashi

Katsunori Tanaka

Ichiro Minato

Hiroyuki Murakami

Kouji Takahashi

Taku Kawakami

Tomoyuki Shibata

Masakatsu Kaneko

Akira Matsuda

Tomowo Kobayashi

Takuma Sasaki

Hitoshi Hotoda

Shinichi Kusanagi

It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body.

Rotary pump having a casing being formed with a communicating hole communicating a space that is between the side plate and the wall surface of the driving machine

Damage of a rotor and a side plate are suppressed with a simple construction to prevent reduction in durability of a vacuum pump. A casing manufacturing method comprises a step (step S) of disposing a cylinder liner forming a cylinder chamber in a mold, and casting a casing main body integrally with the cylinder liner by using molten metal, and a step (step S) of processing an intercommunication hole and an exhaust hole so that the intercommunication hole and the exhaust hole penetrate through both the cylinder liner and the casing main body together and intercommunicate with the cylinder chamber.

Process for manufacturing casing, and vacuum pump

Vacuum pump having rotary compressing elements

Compounds of formula (I): ##STR1## wherein: R.sup.1, R.sup.2 and R.sup.3 are independently selected from the group consisting of hydrogen atoms, optionally substituted alkanoyl groups and alkenylcarbonyl groups, PROVIDED THAT at least one of R.sup.1, R.sup.2 and R.sup.3 represents an unsubstituted alkanoyl group having from 5 to 24 carbon atoms, said substituted alkanoyl group or said alkenylcarbonyl group; and one of R.sup.4 and R.sup.5 represents a hydrogen atom and the other represents a cyano group; have valuable anti-tumor activity.

Pyrimidine nucleoside derivatives having anti-tumor activity, their

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Tokyo, Japan

Yoshihiro Mitsuhashi