Abstract: A web-browser-based heterogeneous systems management tool allows users to remotely, via wireless devices, perform basic services, administration and maintenance of heterogeneous systems, desktops, networked printers, routers and switches, through the use of an application web server. The application web server access a managed systems database for permitting access to users and for providing information to users to permit support to be carried out. Resident management agents run on each of the managed systems to permit commands to be passed to the operating systems of the managed systems. Users may access a specified target system using any web-based wireless device to perform routine tasks and system administration functions from anywhere in the wireless carriers' covered areas.

Abstract: A portable telephone bank includes a group of public telephones connected to a central communication unit. The public telephones permit callers to place telephone calls over a public telephone network. Each of the telephones includes a portable handset that permits a caller to roam within a predetermined range of the portable telephone bank. The central communication unit transmits communication signals from the telephones to the public telephone network via wireless communication channels.

Abstract: A pay telephone includes a keypad, a card reader, and a processor. The keypad receives input signals from a caller. The card reader reads identification data and speed dial numbers from a card received from the caller. The processor receives the input signals from the keypad and the identification data and speed dial numbers from the card reader, and concurrently validates the card using the identification data and initiates a telephone call using the input signals or the speed dial numbers.

Abstract: Cryogenic cooling apparatus includes a tubular heat exchanger comprising a gas supply pipe wound around a former within a Dewar vessel. In use pressurized refrigerant gas is supplied through the pipe to a Joule-Thomson expansion nozzle to liquefy a portion of the gas in the Dewar vessel and low pressure gas then returns between the former and the Dewar vessel. A valve member cooperates with the nozzle to vary its area for automatically varying the flow of the refrigerant gas. The nozzle is fixed and the valve member is movable and connected to a first guide member which affords a first guide surface cooperating with a fixed second guide surface.

Abstract: Cryogenic cooling apparatus of the type including a generally tubular heat exchanger affording two paths, through one of which, in use, refrigerant gas from a supply under pressure is supplied to a Joule-Thompson expansion nozzle to liquify a portion of the gas in a container where the low pressure gas returns through the other path, and a valve member co-operating with the nozzle to vary its effective area for automatically controlling the flow of the refrigerant. The valve member is actuated via an elongate operating member by a movable wall of a bellows situated within or beyond the heat exchanger and exposed on one side to the pressure of a sensing vapor, which, in operation, is in equilibrium with liquid.

Abstract: Cryogenic cooling apparatus of the type including a generally tubular heat exchanger having a warm end and a cold end and affording two paths through one of which refrigerant gas flows from a supply under pressure to an expansion nozzle for producing cooling by means of the Joule Thomson effect in a liquefying chamber whence the low pressure gas returns through the other path to cool the incoming refrigerant, and a valve member cooperating with the nozzle to vary its effective area for automatically controlling the flow of refrigerant is characterized in that the valve is actuated by the expansion of an expander caused by the temperature of the expander itself, the expander being of elongate form and having an anchored end supported by the cold end of the heat exchanger but thermally insulated from it by a path of low thermal conductivity and extending away from the warm end of the heat exchanger to a free end which actuates the valve the expander having a warm end portion of high thermal conductivity extendi