Bifunctional metal-air electrode
Patent 5306579 Issued on April 26, 1994. Estimated Expiration Date: 
October 30, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 30, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3395027 3518123 3650837 3749748 3756980 3925100 Metal/air cells and improved air electrodes for use therein Cell utilizing atmospheric oxygen as depolarizer Air depolarized cell Metal-air depolarized cell having restricted gas passageway InventorsAssigneeApplicationNo. 969433 filed on 10/30/1992US Classes:429/40, Catalytic electrode structure or composition429/42, Having organic constituent as part of the electrode429/44Having an inorganic matrix, substrate or supportExaminersPrimary: Willis, Prince Jr.Assistant: Nuzzolillo, M. Attorney, Agent or FirmInternational ClassH01M 004/92AbstractA bifunctional air-electrode for use in electrochemical energy cells discharges a satisfactory current on the first discharge cycle and operates for a relatively large number of charge-discharge cycles without gas forming between the electrolyte side of the air electrode and the electrolyte. The active layer of the electrode includes an oxygen reduction catalyst having a first oxygen evolution potential and an oxygen evolution catalyst having a second oxygen evolution potential less than the first oxygen evolution potential, the oxygen reduction catalyst being present in a greater concentration proximate the electrolyte side than proximate the air side and the oxygen evolution catalyst being present in a greater concentration proximate the air side than proximate the electrolyte side.Other References
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