Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
299 words
A filter cartridge comprising in combination: a. a porous, solid, short, right cylindrical filter support having a first substantially flat side upon which a filter is placed, and a second, substantially flat side, substantially parallel to said first side; b. a base having a first axis and having a substantially planar closed end and a substantially planar open end substantially parallel thereto separated by a generally cylindrical portion, the closed end thereof having a tapered hole therethrough aligned with the axis for applying vacuum to the filter cartridge, the outside wall of the cylindrical portion of said base being adapted to receive an O-ring, and the inside wall thereof being adapted to receive said cylindrical filter support upon which the filter is placed, such that the filter support and filter are substantially perpendicular to the first axis and the filter is approximately flush with said open end of said base, said base further having a flange portion coextensive with the closed end thereof; c. an O-ring having the appropriate dimensions to fit into the adaptation therefor in the outside wall of said base; and d. a cylindrical cap having a second axis and a first open end and a second open end and a diameter such that said cap slides over said base when the first axis and the second axis are made colinear and the second open end thereof and the open end of said base are facing each other, and said O-ring forms an airtight seal between the outside wall of said base member and the inside wall of said cap, said cap further having a circular lip reducing the diameter of the first open end thereof such that the filter is held in place against said filter support when said cap is compressed against said base.
Claim 2
Dependent Claim
299 words
A filter cartridge comprising in combination: a. a porous, solid, short, right cylindrical filter support having a first substantially flat side upon which a filter is placed, and a second, substantially flat side, substantially parallel to said first side; b. a base having a first axis and having a substantially planar closed end and a substantially planar open end substantially parallel thereto separated by a generally cylindrical portion, the closed end thereof having a tapered hole therethrough aligned with the axis for applying vacuum to the filter cartridge, the outside wall of the cylindrical portion of said base being adapted to receive an O-ring, and the inside wall thereof being adapted to receive said cylindrical filter support upon which the filter is placed, such that the filter support and filter are substantially perpendicular to the first axis and the filter is approximately flush with said open end of said base, said base further having a flange portion coextensive with the closed end thereof; c. an O-ring having the appropriate dimensions to fit into the adaptation therefor in the outside wall of said base; and d. a cylindrical cap having a second axis and a first open end and a second open end and a diameter such that said cap slides over said base when the first axis and the second axis are made colinear and the second open end thereof and the open end of said base are facing each other, and said O-ring forms an airtight seal between the outside wall of said base member and the inside wall of said cap, said cap further having a circular lip reducing the diameter of the first open end thereof such that the filter is held in place against said filter support when said cap is compressed against said base.
Claim 3
Dependent Claim
44 words
The filter cartridge as described in claim 1, wherein said cap has a circular tapered portion contiguous with the circular lip and facing the outside of the first open end such that the filter cartridge may be removably located in an air sampling apparatus.
Claim 4
Dependent Claim
45 words
The filter cartridge as described in claim 1, further comprising at least one support member extending from the inside of the closed end of said base to said filter support, such that said filter support is supported away from the closed end of said base.
Claim 5
Dependent Claim
50 words
The filter cartridge as described in claim 1, further comprising a screen for covering the tapered hole in said base such that absorbing material can be introduced into the volume formed between the second flat side of said filter support and said screen in the interior of the filter cartridge.