Abstract: An apparatus for pumping recovered vapor in a vapor recovery liquid fuel dispenser includes a liquid fuel dispenser apparatus adapted to dispense liquid fuel to a liquid fuel dispenser nozzle proximate a fuel vapor passage. A transducer associated with the dispenser apparatus generates a liquid fuel flow signal indicative of the rate of liquid fuel flow therethrough. A vapor pump driven by an electric motor is arranged to pump vapor from the vapor passage through a vapor pump inlet to a vapor pump outlet and has a characteristic that the flow rate through the vapor pump at a given vapor pump operating speed is inversely proportional to the difference between the vapor pump inlet and outlet pressures. Sensors associated with the inlet and outlet ascertain inlet and outlet pressures and generate signals representative thereof. A controller for the vapor pump includes vapor recovery control electronics and motor drive electronics.

Abstract: A gasoline service station includes gasoline dispensers and a PIN pad including keypads for receiving personal identification numbers and assembled into a network for securely communicating personal identification numbers from the PIN pads and dispensers to a host computer over unsecured data lines. The PIN pads and dispensers each include means for encryption and outputting of personal identification numbers. A security module includes means for decryption of data associated with each PIN pad and dispenser in a process for the respective PIN pads and dispensers and means for encryption of data associated with the host computer in a process which is different from its decryption of data associated with the PIN pads and dispensers.

Abstract: A method and apparatus for installing in a well conduit by a single trip on an auxiliary conduit a combination well condition sensing device and flow cut off valving elements. The cooperating valving elements are of annular configuration and the auxiliary conduit passes through the bore of the valving elements and is mechanically connected to one of the valving elements. The entire apparatus may be run into the well conduit in a single trip on the auxiliary conduit and actuated to a flow shut off position by longitudinal manipulation of the apparatus. Pressurization of the upper well conduit and secondary manipulation of the apparatus and the auxiliary conduit permits the return of the valving elements to an open flow position.