Engine vent vapor filter and method of constructing same

Claim 1

In a volumetrically controlled cranckcase ventilation system for internal combustion engines, including a support and cover structure, a container for collecting liquid and solid particles which is sealed at its open end to said support and cover structure, a filter cartridge for retaining small particles, and a control valve, the method of construction of said filter cartridge comprising the steps of: a. rolling a sheet of perforated metal to form a relatively rigid cylindrical frame open at top and bottom; b. wrapping an outer layer of filter cloth around said frame, and coextensive therewith; c. attaching and sealing to one end of said frame and filter cloth a closure plate comprising a shallow dish; comprising the sub-steps of; 1. placing in the corner of said closure plate a selected amount of thermosetting liquid; 2. placing said frame and filter cloth in said closure plate so that said liquid will wet said frame and filter cloth; and 3. heating the assembly of said frame and filter cloth and closure plate to cause said thermosetting liquid to set; d. forming a molded support and sealing flange at the second end of said frame, of thermosetting material, so as to seal and surround the ends of said frame and filter cloth, and to form a substantially rigid flange; whereby said flange is adapted to be clamped and sealed to said support and cover structure to support said cartridge; comprising the sub steps of;