Gelman Sciences, Inc.

Charles E vonReis

Attila Vadnay

Robert E Corbett

Karlis Vizulis

The disposable filter device of the invention has a housing with a fluid inlet chamber and fluid outlet chamber separated by a hydrophobic filter and having a hydrophilic filter on the inlet chamber side of the hydrophobic filter. In the liquid aspirating system, the disposable filter device is connected between the liquid collection container and the inlet to the aspirator, the hydrophobic filter functioning to prevent the passage of any liquid to the aspirator and the hydrophilic filter functioning to prevent a large accumulation of liquid on the inlet chamber of the filter device and to better assure against any spillage of liquid in the inlet chamber during replacement of the device.

Disposable filter device and liquid aspirating system incorporating same

The disposable filter device of the invention is particularly suited for testing for the amounts of tars and nicotine in cigarettes and comprises a housing having two components (2,4) one of which has a cylindrical portion (8) and the other of which has an annular flange (48) whereby the two members can be telescoped together with a filter disc (6) therebetween for collecting the tars and nicotine. The member with the cylindrical portion is formed of a relatively soft resilient substantially non-hygroscopic polymer and the member with the annular flange is formed of a relatively hard substantially non-hygroscopic polymer. The resiliency of the member with the cylindrical portion in combination with the relative hardnesses of the members and the particular shapes of the telescoped portions (12,48) enables the two members to be removably secured together with an excellent seal therebetween. Because both members are of substantially non-hygroscopic polymers, the device is substantially free of moisture absorption and hence free of inaccuracies, due to moisture absorption, in determining the amounts of tar and nicotine collected.

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Ann Arbor, MI, United States of America

Charles E vonReis