Slow release coolant filter

A coolant filter for use in filtering a coolant solution which flows through the coolant filter and being designed for the release of a supplemental coolant additive into said coolant solution, said coolant filter comprising:

• a filter housing assembly defining a flow outlet and flow inlet means;
• a filter element positioned inside said filter housing assembly;
• an endplate member which is configured with an interior chamber, said endplate member in cooperation with said filter element defining an interior space for receiving filtered coolant solution;
• a source of supplemental coolant additive positioned within said interior chamber;
• and
• a diffusion tube comprising part of said endplate member and defining a diffusion orifice which is disposed between said source of supplemental coolant additive and said flow outlet for permitting a portion of said filtered coolant solution from said interior space to enter said interior chamber to dissolve said supplemental coolant additive and for controlling the rate of release of said supplemental coolant additive from said interior chamber into said filtered coolant solution in said interior space.

A coolant filter for use in filtering a coolant solution which flows through the coolant filter and being designed for the release of a supplemental coolant additive into said coolant solution, said coolant filter comprising:

• a filter housing assembly defining a flow outlet and flow inlet means;
• a filter element positioned inside said filter housing assembly;
• an endplate member which is configured with an interior chamber, said endplate member in cooperation with said filter element defining an interior space for receiving filtered coolant solution;
• a source of supplemental coolant additive positioned within said interior chamber;
• and
• a semipermeable membrane wafer assembled to said endplate member and disposed between said source of supplemental coolant additive and said flow outlet for permitting a portion of said filtered coolant solution from said interior space to enter said interior chamber to dissolve said supplemental coolant additive and for controlling the rate of release of said supplemental coolant additive from said interior chamber into said filtered coolant solution in said interior space.

A coolant filter cartridge for installing into a filter housing assembly for the filtering of a coolant solution, said coolant filter cartridge being designed for the release of a supplemental coolant additive into said coolant solution, said coolant filter cartridge comprising:

• a filter element having a first end and opposite thereto a second end;
• a first endplate bonded to the first end of said filter element;
• a second endplate bonded to the second end of said filter element, said second endplate configured so as to define an interior chamber, said second endplate member in cooperation with said filter element defining an interior space for receiving filtered coolant solution;
• a source of supplemental coolant additive positioned within said interior chamber;
• a closing member assembled to said second endplate so as to enclose said interior chamber;
• and
• slow release means disposed between said source of supplemental coolant additive and said flow outlet for permitting a portion of said filtered coolant solution from said interior space to enter said interior chamber to dissolve said supplemental coolant additive and for controlling the rate of release of said supplemental coolant additive from said interior chamber into said filtered coolant solution in said interior space.