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:
Jan. 23, 2024
Filed:
Apr. 17, 2020
Nippon Pillar Packing Co., Ltd., Osaka, JP;
Masanao Ishijima, Osaka, JP;
Osamu Suzuki, Osaka, JP;
Yasuyuki Okunishi, Osaka, JP;
Shuhei Matsui, Osaka, JP;
NIPPON PILLAR PACKING CO., LTD., Osaka, JP;
Abstract
Each of mechanical seal devicesof a rotary jointincludes a first shaft side seal ringand a second shaft side seal ringattached to a shaft body, and a first case side seal ringand a second case side seal ringattached to a case body. The first shaft side seal ringand the second shaft side seal ringhave contact surfacesandaxially facing each other and coming into contact with each other, and groovesandfor forming a second communication flow passageconnecting a second outer flow passageand a second inner flow passageare formed in both the contact surfacesand