Leakproof dry cell

Claim 1

A DRY CELL COMPRISING A ZINC CUP ELECTRODE, ELECTROLYTE-CONTAINING ELEMENTS AND A POROUS CARBON ELECTRODE DISPOSED WITHIN THE ZINC CAP, AND MEANS FOR SEALING THE CELL COMPRISING AN IMPERVIOUS TERMINAL AND CLOSURE CAP OVERLYING SAID CARBON ELECTRODE AND SECURED TO THE UPPER EDGE OF SAID ZINC CUP, THE JOINT BETWEEN SAID CAP AND SAID CUP BEING PERVIOUS TO GAS, A GAS-IMPERVIOUS SOFT PLASTIC SEAL DISPOSED ABOVE THE ELECTROLYTE-CONTAINING ELEMENTS OF SAID CELL AND INITIALLY SPACED FROM SAID CAP AND FROM THE JOINT BETWEEN SAID CAP AND SAID CUP, SAID CARBON ELECTRODE EXTENDING THROUGH SAID SOFT PLASTIC SEAL WHEREBY GAS GENERATED WITHIN SAID CELL MAY INITIALLY PASS THROUGH SAID CARBON ELECTRODE INTO THE SPACE BETWEEN SAID CAP AND SEAL AND THENCE ESCAPE THROUGH THE JOINT BETWEEN SAID CAP AND SAID CUP, SAID SEAL BEING DISPLACEABLE BY PRESSURE OF GAS WITHIN SAID CELL AND MOVABLE BY SUCH PRESSURE TO A POSITION IN WHICH IT SEALS THE JOINT BETWEEN SAID CAP AND SAID CUP.