Abstract: The invention is directed to a method for making filter preparations including a filter sheet for receiving specimens thereon. The method includes cutting a flexible sheet of material to form a filter frame, and slitting the filter frame to form two slits with a central hole therebetween. The two slits define inner edges of parallel framing parts in the filter frames and outer edges of a presser part. One end of the presser part is pulled upward, and the filter sheet is inserted between the presser parts and the parallel framing parts. Then, the presser part is released downward and restored to its original position, so that the filter sheet contacts an undersurface of the presser part and is contained in the slits between the presser part and the parallel framing parts. The filter sheet also adheres to an upper surface of the parallel framing parts and a portion of the filter sheet is exposed through the central hole for receiving mounting specimens thereon.

Abstract: A filter for preparations including a sheet form filter frame made of flexible material and a porous filter sheet, in which said filter frame has an external size suitable to set on a slide glass and is slit to form an open-sided presser part with an opening bored therethrough and parallel framing parts. The filter sheet is applied to the under surface of the presser part, passed through both slits between the presser part and the parallel framing parts and adhered on the upper surface of the parallel framing parts. When using this filter, specimens are mounted on the filter sheet which is then sheared off between the presser part and the parallel framing parts. Subsequently, the filter frame is placed on a glass slide and then removed from the glass slide so as to only leave said filter sheet with the specimens mounted thereon.