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:
Jun. 02, 2015
Filed:
Jan. 17, 2011
Katsuhito Kuwahara, Tokyo, JP;
Hiroyuki Nakamura, Tokyo, JP;
Toru Toma, Tokyo, JP;
Yoshino Kogyosho Co., Ltd., Tokyo, JP;
Abstract
An improved pump is provided that is capable of achieving excellent back suction function by using a depression head, without compromising the ease of depression operations of the head due to the additional function. The pump includes a depression head and an annular piston. The depression head is urged upward and is relatively displaceable with respect to the stem. When depressed, a lever member of the depression head operates to open a discharge opening. An annular piston opens a discharge valve, in an uppermost displacement position and closes the discharge valve in a lowermost displacement position. Back suction is caused due to a negative pressure state occurring in the stem until the discharge valve seat is closed by the annular piston during upward displacement of the stem.