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:
Oct. 31, 2023
Filed:
Jul. 10, 2020
Edwards Japan Limited, Chiba, JP;
Shunsuke Takeda, Chiba, JP;
Yoshiyuki Sakaguchi, Chiba, JP;
Edwards Japan Limited, Chiba, JP;
Abstract
A vacuum pump includes a linked-type thread-groove spacer which is a structure for linking a Siegbahn pump portion and a thread-groove pump portion, and when an outlet position of a thread groove which is an exhaust channel portion of this linked-type thread-groove spacer is in a vicinity of the stator portion (stator bolt) of the stator column, conductance of the exhaust channel is lowered. Thus, phases in a circumferential direction of installation positions of a thread ridge of the linked-type thread-groove spacer and the stator portion of the stator column are aligned as much as possible. In other words, the thread groove of the linked-type thread-groove spacer which is the exhaust channel is provided between the installation positions of the stator portions in the circumferential direction of the stator column so that lowering of the conductance of the exhaust channel is suppressed.