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. 31, 2026
Filed:
Jul. 29, 2021
Nok Corporation, Tokyo, JP;
Hiroka Yamaguchi, Fukushima, JP;
Kokichi Hamamoto, Fukushima, JP;
Hideaki Nagahamaya, Fukushima, JP;
Yuki Sato, Fukushima, JP;
Kenya Yoshioka, Fukushima, JP;
NOK CORPORATION, , JP;
Abstract
A sealing device includes a seal lip slidably contacting an outer surface of an inside member and seals liquid in an internal space of an outside member. The seal lip has a liquid-side inclined surface, an atmosphere-side inclined surface, and a lip edge between the liquid-side and atmosphere-side inclined surfaces and extending circumferentially. Helical ribs contacting the outer surface of the inside member are on the atmosphere-side inclined surface, and incline relative to the lip edge. Each rib has a linear portion having parallel side walls and a ship-bottom-shaped portion curving to expand further than the side walls, the linear portion extends from the lip edge, and the ship-bottom-shaped portion is farther from the lip edge than the linear portion. A height of each linear portion relative to the atmosphere-side inclined surface is 5 μm to 37 μm.