Abstract: Refrigerant compositions containing oxazolyl-coumarin dyes for leak detection under ultraviolet light, and methods for the use of such dyes in leak detection.

Abstract: A self-service gasoline station fuel delivery control and registration system having a central control unit with a display console, operating keyboard and master microprocessor module; separate slave microprocessor modules for the gasoline pumps for separately controlling the pumps and accumulating the amount of gasoline delivered thereby and connected for sequential communication with the master microprocessor module by common slave bus means; and peripheral controllers connected for selective communication with the master microprocessor module by common peripheral bus means for operating the system and/or registering the amount of gasoline delivered.

Abstract: A fuel delivery control and registration system having a bank of four BCD price switches for establishing a unit volume price within a four place price range; a BCD memory for accumulating BCD cost and volume amounts of the fluid dispensed; a binary adder summation circuit operated by a decimal volume pulse provided for each one-hundredth increment or one-thousandth increment of a unit volume, depending on the established unit volume price, for indexing the BCD volume amount stored in the memory one count and for indexing the BCD cost amount stored in the memory by the decimal price of the decimal volume pulse increment; and cost and volume indicators with incandescent 7-segment numeral displays for registering the cost and volume amounts stored in the BCD memory.

Abstract: An electronic multiple level predetermining system having a single level predeterminer adapted to be indexed for accumulating a primary count and for generating a primary predetermining signal when the accumulated count reaches a primary predetermining level and a control system operable by an input pulse to index the predeterminer one count in one direction for accumulating a primary count of the input pulses and through an additional bidirectional counting cycle for generating a secondary predetermined signal at a secondary predetermining level.