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:
Aug. 03, 2021
Filed:
Aug. 09, 2017
Edwards Japan Limited, Chiba, JP;
Edwards Japan Limited, Chiba, JP;
Abstract
A vacuum pump reduces a stress without reducing the rotation speed of a rotating cylindrical body. In an outlet port-side lower portion of a rotor cylindrical portion included in the vacuum pump, a smaller diameter portion having an outer diameter smaller than that of an inlet port-side portion of the rotor cylindrical portion is provided. A lowermost end portion (outlet port-side end portion) of the rotor cylindrical portion is designed longer than a thread groove exhaust element to provide an extending portion. In the extending portion, a smaller diameter portion having an outer diameter smaller than that of the inlet port-side portion of the rotor cylindrical portion which is opposed to the thread groove exhaust element is provided.