Abstract: A unitary housing made from an acoustically-opaque, resilient material is employed with a microphone element to form a directional microphone assembly. The microphone element includes a diaphragm which moves under the influence of sound pressure applied to its opposite surfaces to generate an electrical signal which is proportional to the differential sound pressure. The unitary housing includes a first acoustically-transparent channel for communicating sound pressure from a first port in the unitary housing to one surface of the diaphragm, and a second acoustically transparent channel for communicating sound pressure from a second port in the unitary housing to the other surface of the diaphragm. In an illustrative embodiment, the unitary housing comprises a unitary small "boot" having a surface including the ports for coupling acoustic energy to the acoustic channels, an inner chamber for housing the microphone element and a predetermined opening in a surface of the boot for accessing the inner chamber.

Abstract: An electrochemical cell and method for improving voltage regulation of said cell. The cell employs lithium as an anode, lithium tetrachloroaluminate as an electrolyte, sulfur dioxide as a solvent, and high surface area carbon black containing cupric chloride as a cathode. Oxidizing agents such as halides and oxyhalides are employed to improve voltage regulation.

Abstract: A rechargeable non-aqueous electrochemical cell. The cell has a positive terminal, a negative terminal, a cathode collector attached to the positive terminal and an anode of alkaline metal connected to the negative terminal. The cell further possesses a non-aqueous electrolyte solution in contact with the cathode and anode. The cathode collector is composed of a chrome foil plated upon a core of nickel.

Abstract: A rechargeable electrochemical cell which resists venting in an over-discharge condition. A first microporous membrane is provided as a separator between the cell's anode and cathode, which allows for the passage of cell electrolyte, but inhibits the passage of metal dendrites. A tab extends from the anode to the cell casing and between the tab and inner wall of the cell casing is provided a second microporous membrane characterized as being less resistant to the passage of alkaline metal dendrites than the first microporous membrane.

Abstract: A rechargeable electrochemical cell having a cell casing housing a stack of spirally wound elements which include an alkaline metal anode, a cathode or cathode collector and a separator. A method is provided for preventing alkaline metal dendrites from forming on any surface within the cell casing and external to the stack of spirally wound elements.

Abstract: An electrochemical cell and method for improving voltage regulation of said cell. The cell employs lithium as an anode, lithium tetrachloroaluminate as an electrolyte, sulfur dioxide as a solvent, and high surface area carbon black containing cupric chloride as a cathode. A lithium halide, such as LiCl or LiBr, is employed to improve voltage regulation.

Abstract: A lithium or lithium alloy cathode, instead of the cathode foils of commercial electrolytic capacitors, can substantially increase the volumetric energy density of a valve metal/metal oxide capacitor. The capacitors exhibit a voltage capability unexpectedly higher than the voltage supported by the anode alone. This unexpected advantage is achieved by constructing a capacitor including (1) a negative electrode comprising lithium or a lithium alloy; (2) a positive electrode comprising a relatively high surface area valve metal having a relatively thin oxide surface film; (3) a separator material disposed between the positive and negative electrodes to physically separate the electrodes and capable of allowing the passage of ions through the material between the electrodes and (4) an organic, non-aqueous electrolyte containing lithium ions and compatible with both electrodes.

Abstract: An electrical capacitor is described which comprises a housing, a pair of electrodes in said housing, one of said electrodes being composed of a mixture of carbon particles and an electrolyte and the other electrode being composed of a mixture of lead metal and the same electrolyte, and an ionically conductive separator means between and in contact with said pair of electrodes, electronically separating said electrodes from each other, wherein the electrolyte comprises an acidic solution of soluble sulfate salts.