Abstract: A hand saw for penetrating and cutting drywall, comprising a handle, an elongated blade having generally opposed blade top and bottom edges, the blade top edge being flat and said blade bottom edge having saw teeth for cutting drywall, the blade having an inner end and an opposed free end area, the inner end being attached to the handle and the free end area having a tapered sharpened cutting edge extending from the blade bottom edge at the saw teeth to the blade top edge. The cutting edge is formed by a pair of inwardly tapered flat surfaces of the blade between the blade top and bottom edges at the free end area that converge at the sharpened cutting edge. A pointed tip is defined by the blade flat top side and the tapered cutting surface and the pair flat surfaces and by the blade flat top side. A hand stop is connected to the top side of the handle. The blade bottom edge is slightly tapered upwardly relative to the blade top edge between the handle and the free end area at the sharpened cutting edge.

Abstract: A hand saw for penetrating and cutting drywall, comprising a handle, an elongated blade having generally opposed blade top and bottom edges, the blade top edge being flat and said blade bottom edge having saw teeth for cutting drywall, the blade having an inner end and an opposed free end area, the inner end being attached to the handle and the free end area having a tapered sharpened cutting edge extending from the blade bottom edge at the saw teeth to the blade top edge. The cutting edge is formed by a pair of inwardly tapered flat surfaces of the blade between the blade top and bottom edges at the free end area that converge at the sharpened cutting edge. A pointed tip is defined by the blade flat top side and the tapered cutting surface and the pair flat surfaces and by the blade flat top side. A hand stop is connected to the top side of the handle. The blade bottom edge is slightly tapered upwardly relative to the blade top edge between the handle and the free end area at the sharpened cutting edge.

Abstract: A separator plate for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced.

Abstract: A separator plate for a fuel cell comprising an anode current collector, a cathode current collector and a main plate, the main plate disposed between the anode current collector and the cathode current collector. The anode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the anode side of the separator plate and the cathode current collector forms a flattened peripheral wet seal structure and manifold wet seal structure on the cathode side of the separator plate. In this manner, the number of components required to manufacture and assemble a fuel cell stack is reduced.

Abstract: A fuel cell electrolyte with an electrochemically inactive matrix, an electrochemically active electrolyte, and a substantially gas impervious metallic foil in the central region of the thickness of the electrolyte extending around its periphery over at least a portion of the fuel cell peripheral seal area and into the electrolyte active area reducing gas crossover between the anode and cathode chambers. The gas impervious metallic foil may extend beyond the periphery of the electrolyte into the fuel cell peripheral seal area and have a resilient gasket on each side forming the fuel cell peripheral seal with seal structures extending from separator plates, thereby eliminating conventional electrolyte wet seals. The seal structures according to this invention are also suitable for sealing internal manifolds in fuel cell stacks.