Liquid agent container

Patent metadata

Field	Value
Publication number	US-9308150-B2
Application number	US-51632207-A
Country	US
Kind code	B2
Filing date	Nov 13, 2007
Priority date	Nov 27, 2006
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A liquid agent container includes the container's main unit, a cap, an intermediate member, and an internal stopper. The cap is provided with a liquid agent discharging path and an air introducing path. The intermediate member has a tube projecting toward the interior of the main unit. Between a liquid agent introducing path and the liquid agent discharging path a hydrophilic filter is provided, and between an air supplying path communicating with the air introducing path and an air delivering path a filter is provided. The air delivering path communicates with the interior of the main unit via a check valve, with an annular valve having an inner circumferential surface in contact with an outer circumferential surface of the tube, to pass air only in a direction toward the interior of the main unit. The present invention can provide a liquid agent container including a check valve readily fabricated and ensuring preventing a liquid agent from flowing back.

First claim

The invention claimed is:

1. A liquid agent container comprising:
a main unit having a mouth, and deformable by a pressure exerted to press said main unit, and recovering an original form in geometry when said main unit is liberated from the pressure;
a cap provided with a liquid agent discharging path for discharging a liquid agent and an air introducing path for introducing air, and attached to said main unit at said mouth;
a hydrophilic filter provided at a bottom surface of said cap;
an intermediate member having a tube projecting toward an interior of said main unit, said intermediate member being provided with a liquid agent introducing path provided internal to said tube and communicating with said liquid agent discharging path via said hydrophilic filter provided between said cap and said intermediate member, and an air supplying path communicating with said air introducing path, said intermediate member being located at an internal side of said cap, an outer peripheral surface of the tube being provided with an air vent groove extending along said liquid agent discharging path;
a filter; and
an internal stopper having an annular valve configuring a check valve having an inner circumferential surface in contact with an outer circumferential surface of said tube and passing air only in a direction toward the interior of said main unit, said internal stopper being provided with an air delivering path communicating with said air supplying path via said filter and communicating with the interior of said main unit via said check valve, said internal stopper being located at an internal side of said intermediate member,
wherein said filter is attached to a bottom surface of said intermediate member, such that a center of the filter is offset from a center of said intermediate member, and said filter is provided between said intermediate member and said internal stopper, and
said internal stopper has an outer circumferential flange, and the outer circumferential flange of the internal stopper and an outer circumferential portion of the intermediate member are stacked and sandwiched between an end surface of the mouth of the main unit and the cap.

2. The liquid agent container according to claim 1 , wherein said check valve removes a hermetically sealed state, in response to said main unit having an internal pressure lower than an atmospheric pressure with a difference of at least 5 KPa, to pass air proceeding through said air delivering path toward the interior of said main unit.

3. The liquid agent container according to claim 1 , wherein said hydrophilic filter is provided between said liquid agent discharging path and said liquid agent introducing path and said filter provided between said air supplying path and said air delivering path is attached to said intermediate member.

4. The liquid agent container according to claim 1 , wherein said filter provided between said air supplying path and said air delivering path is a hydrophobic filter.

5. The liquid agent container according to claim 1 , wherein said end surface of said mouth of said main body is provided with a circular rib, and said circular rib digs into said internal stopper.

6. The liquid agent container according to claim 1 , wherein said internal stopper has a first outer circumferential surface that extends in a vertical direction, and said intermediate member has a second outer circumferential surface that extends in the vertical direction forming a common surface with the first outer circumferential surface, and said cap has an inner circumferential surface extending in the vertical direction and directly opposing the common surface.

7. The liquid agent container according to claim 1 , wherein said internal stopper is provided with a fit hole located coaxially with said check valve and receiving said tube to fit said tube therein.

8. The liquid agent container according to claim 7 , wherein the air vent groove and an internal surface of said fit hole define the air delivering path.

Assignees

• Kubo Tomohiko
• Kishimoto Kazuya
• Nipro Corp
• Wakamoto Pharma Co Ltd

Inventors

• Kubo Tomohiko
• Kishimoto Kazuya

Classifications

• B65D47/18

  for discharging drops; Droppers (droppers in general B01L3/00; {pipettes connected to container closures B01L3/0282}) · CPC title

• A61J1/1412 Primary

  Containers with closing means, e.g. caps · CPC title

• A61J1/1418 Primary

  Threaded type · CPC title

• A61J1/145

  using air filters · CPC title

• B65D51/1633

  whereby venting occurs by automatic opening of the closure, container or other element · CPC title