Method of making a galvanic cell having a resealable vent closure

Claim 1

A method for making a galvanic dry cell having a low pressure resealable vent closure which comprises the steps: a. placing within a container having a top open end and an inner disposed anode, a porous separator to contact the anode, a cathode depolarizer mix so as to be disposed within said separator, a cathode collector rod so as to be partially embedded within the center of the cathode depolarizer mix such that the rod projects above the top surface of the depolarizer mix, and an electrolyte; b. preparing a gas impermeable resiliently compressible elastomeric sponge gasket having a central opening with a diameter equal to or larger than the diameter of the cathode collector rod and an outer diameter larger than the diameter of the container; c. aligning the sponge gasket over the cathode collector rod and resting it on the top edge of the open end of the container; d. preparing a cover having a central recess substantially equal to the diameter of the cathode collector rod and an outer diameter equal to the inner diameter of the container minus at most about two times the thickness of the sponge gasket; e. placing the cover over the top of the container with the recess aligned with the cathode collector rod and then forcing the cover into the container thereby compressing the sponge gasket between the cover and the inner upper wall of the container; and f. crimping the top edge portion of the container over the sponge gasket.

Claim 2

A method for making a galvanic dry cell having a low pressure resealable vent closure which comprises the steps: a. placing within a container having a top open end and an inner disposed anode, a porous separator to contact the anode, a cathode depolarizer mix so as to be disposed within said separator, a cathode collector rod so as to be partially embedded within the center of the cathode depolarizer mix such that the rod projects above the top surface of the depolarizer mix, and an electrolyte; b. preparing a gas impermeable resiliently compressible elastomeric sponge gasket having a central opening with a diameter equal to or larger than the diameter of the cathode collector rod and an outer diameter larger than the diameter of the container; c. aligning the sponge gasket over the cathode collector rod and resting it on the top edge of the open end of the container; d. preparing a cover having a central recess substantially equal to the diameter of the cathode collector rod and an outer diameter equal to the inner diameter of the container minus at most about two times the thickness of the sponge gasket; e. placing the cover over the top of the container with the recess aligned with the cathode collector rod and then forcing the cover into the container thereby compressing the sponge gasket between the cover and the inner upper wall of the container; and f. crimping the top edge portion of the container over the sponge gasket.

Claim 6

A method for making a galvanic dry cell having a low pressure resealable vent closure which comprise the steps: a. preparing a raw cell by placing within a container having a top open end and an inner disposed anode, a porous separator to contact said anode, a cathode depolarizer mix so as to be disposed within said separator, a cathode collector rod so as to be embedded within the center of the cathode depolarizer mix such that the rod projects above the top surface of the depolarizer mix, and an electrolyte; b. preparing a cover-gasket assembly by making a rigid cover with an outer side wall and a central recess substantially equal to the diameter of the cathode collector rod, coaxially securing to the lower portion of the cover a gas impermeable resiliently compressible elastomeric sponge annular gasket having a central opening with a diameter equal to or longer than the diameter of the central recess in the cover so as not to block the opening of said recess, and making the diameter of the outer side wall of the cover equal to the inner diameter of the container minus at most about two times the thickness of the sponge gasket; c. placing the cover-gasket assembly over the top of the container with the cover recess aligned with the cathode collector rod and then forcing the cover-gasket assembly into the container thereby compressing the outer portion of the sponge gasket between the outer side wall of the cover and the inner upper wall of the container; and d. crimping the top edge portion of the container over the sponge gasket.

Claim 7

A method for making a galvanic dry cell having a low pressure resealable vent closure which comprise the steps: a. preparing a raw cell by placing within a container having a top open end and an inner disposed anode, a porous separator to contact said anode, a cathode depolarizer mix so as to be disposed within said separator, a cathode collector rod so as to be embedded within the center of the cathode depolarizer mix such that the rod projects above the top surface of the depolarizer mix, and an electrolyte; b. preparing a cover-gasket assembly by making a rigid cover with an outer side wall and a central recess substantially equal to the diameter of the cathode collector rod, coaxially securing to the lower portion of the cover a gas impermeable resiliently compressible elastomeric sponge annular gasket having a central opening with a diameter equal to or longer than the diameter of the central recess in the cover so as not to block the opening of said recess, and making the diameter of the outer side wall of the cover equal to the inner diameter of the container minus at most about two times the thickness of the sponge gasket; c. placing the cover-gasket assembly over the top of the container with the cover recess aligned with the cathode collector rod and then forcing the cover-gasket assembly into the container thereby compressing the outer portion of the sponge gasket between the outer side wall of the cover and the inner upper wall of the container; and d. crimping the top edge portion of the container over the sponge gasket.