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:
Apr. 08, 2025
Filed:
Jan. 11, 2022
Edwards Japan Limited, Yachiyo, JP;
Tooru Miwata, Yachiyo, JP;
Yoshiyuki Sakaguchi, Yachiyo, JP;
Edwards Japan Limited, Yachiyo, JP;
Abstract
There are provided a vacuum pump which can effectively prevent stress corrosion cracking of a rotating body and has excellent corrosion resistance, and a rotating body of the vacuum pump. In a vacuum pump (e.g., a turbo-molecular pump) exhausting gas by rotation of a rotating bodythe rotating bodyhas, on a surface thereof, a first areacovered with a first surface treatment layerA and a second areacovered with a second surface treatment layerA, and a boundary portionbetween the first areaand the second areahas an area in which the surface treatment layersA andB of the first and second areasandoverlap each other.