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Filter package
| Details |
Inventors: Hopkins, Scott D.; Spencer, Daniel W.; Peri, Joseph A.;
Assignee: Pall Corporation (East Hills, NY)
Primary Examiner: Fortuna; Ana
Assistant Examiner:
Attorney, Agent or Firm: Leydig, Voit & Mayer, Ltd.
A method of forming a filter package includes disposing a filter and a liquid in a container with the filter immersed in the liquid and sanitizing the liquid and the filter while in the container. After sanitizing, the container may be hermetically sealed to enclose the sanitized liquid and filter. The container may be vented during sanitizing to allow vapor of the liquid to exit from the container and prevent pressure from building up in the container. The container may be either rigid or flexible. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a filter package containing a filter and a noncontaminating liquid with substantially no contaminants, the filter package having a long shelf life without employing bactericides.
It is another object of the present invention to provide a method of preparing such a filter package.
The present invention provides a filter package including a container, a filter enclosed by the container, and a noncontaminating liquid water disposed in the container and immersing the filter.
The noncontaminating liquid is preferably one which contains substantially no substances, such as bactericides or other organic or inorganic substances, which could be considered contaminants with respect to the filter or its intended use.
For example, the level of contaminants in the noncontaminating liquid is preferably at most in the parts per billion range.
In preferred embodiments, the noncontaminating liquid comprises deionized water having an initial resistivity of at least 18 M.
OMEGA.
-cm.
The container may have any desired degree of rigidity.
In one form of the present invention, the container comprises a thin-walled, flexible bag.
The bag may be equipped with a venting mechanism for venting vapor from the bag during heating.
In another form of the invention, the container comprises a rigid container such as a filter housing.
The filter in the container may be merely wet by the water, i.
e.
, have its surface contacted by the water, or it may be wetted by the water, i.
e.
, have its pores substantially permeated by the water in the container.
The present invention also provides a method of preparing a filter package including disposing a filter and a liquid in a container with the filter immersed in the liquid.
The liquid and the filter are then sanitized and preferably sterilized while in the container.
If desired, the container may be hermetically sealed after sanitizing.
The contents of the filter package of the present invention are at least sanitized, i
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