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:
May. 23, 1989
Filed:
Nov. 06, 1987
Sosuke Kinouchi, Kakogawa, JP;
Hideto Yoshitake, Akashi, JP;
Kawasaki Jukogyo Kabushiki Kaisha, Hyogo, JP;
Abstract
A fin tab device for a marine vessel driven by a propeller is provided with a fin-shaped main fin tab member and a fin-shaped sub-fin tab member, both tab members extending downwardly from a substantially planar fixing portion detachably and adjustably secured to the bottom face of a stern structure. The two tab members are in an in-line, spaced-apart, tandem relation, the sub-fin tab member projecting downwardly a shorter distance than the main fin tab member. The sub-fin tab member is at a positon between the tip circle of the propeller and the main fin tab member. Cavitation bubbles first collide with the sub-fin tab member, imparting impact force thereto, whereby the lower end portion thereof is broken while the main fin tab member is shielded and protected by the sub-fin tab member.