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:
Apr. 20, 1999
Filed:
Nov. 12, 1997
Applicant:
Inventor:
Koji Hirota, Kanazawa, JP;
Assignee:
Shinko Kagaku Kabushiki Kaisha, Ishikawa-ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01F / ;
U.S. Cl.
CPC ...
2223212 ; 2223216 ; 2223219 ;
Abstract
In a pump mechanism for ejecting liquid, an upper inside wall of a bell-shaped portion which is formed around a lower end of a first piston constitutes a guide surface inclined upward toward an axial hole of the first piston. The guide surface serves to prevent entrapping of air underneath the upper inside wall of the bell-shaped portion, or in an upper part of a metering chamber and stabilize the amount of liquid measured in each successive spraying action.