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:
Jul. 02, 2013
Filed:
Jun. 25, 2007
Hideto Kunishi, Kurashiki, JP;
Yasujiro Ohara, Tokyo, JP;
Katsuhito Kuwahara, Tokyo, JP;
Toru Toma, Tokyo, JP;
Satoshi Sakamoto, Tokyo, JP;
Hideto Kunishi, Kurashiki, JP;
Yasujiro Ohara, Tokyo, JP;
Katsuhito Kuwahara, Tokyo, JP;
Toru Toma, Tokyo, JP;
Satoshi Sakamoto, Tokyo, JP;
Kuraray Noritake Dental Inc., Kurashiki-shi, JP;
Yoshino Kogyosho Co., Ltd., Tokyo, JP;
Abstract
A syringe has a dripless feature by using an O-ring located between a conical disc and a flat plunger disc in an annular groove on a moving plunger. The flat plunger disc has a series of projections that offset the o-ring off the flat plunger disc surface when the plunger is not actuated. When the plunger is actuated, the o-ring distorts to rest on the projections and also on the surface of the flat plunger disc. When the plunger is released, the o-ring's resiliency pulls the o-ring back to its original shape which sucks back the fluid being dispensed so that no or less drips occur.