The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2003
Filed:
Oct. 16, 2001
Junichi Kurokawa, Yokohama, JP;
Hitoharu Kimura, Chiyoda-machi, JP;
Tomoyshi Okamura, Minori-machi, JP;
Takahide Nagahara, Abiko, JP;
Sumio Sudo, Chiyoda-machi, JP;
Akira Manabe, Chiyoda-machi, JP;
Norimitsu Kuwabara, Yasato-machi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A turbo machine comprising: an impeller having a plurality of blades therewith; a casing having a flow surface defined therein and being positioned with the impeller therein; and a plurality of grooves being formed in the flow surface of the casing, for connecting between an inlet side of said impeller and an area on the flow surface of the casing in which the blades of said impeller reside. Each groove has a length of at least part of which is oriented in an axial direction of the casing, a width measured in a circumferential direction, and a depth. The width of each groove is equal to or greater than the depth thereof.