Donald L McLaughlin, Ronald W Streiber: Reducing power consumption in calculators. MOS Technology, Cooper Dunham Clark Griffin & Moran, March 2, 1976: US03941989 (139 worldwide citation)

Continuous power and a high rate clock are supplied to a calculator while it is in an execute mode and is actually decoding and processing input information, but lower duty cycle power and lower duty cycle clock pulses are supplied during the subsequent display mode, when the only requirement is to ...

Donald L McLaughlin, Elwood E Barnes: Vending machine accountability system. Mars Incorporated, Davis Hoxie Faithfull & Hapgood, June 9, 1981: US04272757 (27 worldwide citation)

An accountability system for a vending machine system having means for vending products and means for determining credit, the accountability system comprising a portable electronic data file module which is removable from the system, and means for collecting transaction data from the vending machine ...

Donald L McLaughlin: Programmable vending machine accountability apparatus. Mars Incorporated, Davis Hoxie Faithfull & Hapgood, May 28, 1985: US04520451 (17 worldwide citation)

A programmable accountability apparatus for installation into a vending machine is disclosed. The accountability apparatus comprises a plurality of monitoring wires attachable to points within the vending machine carrying AC signals selected for monitoring, means for converting the AC signals into d ...

Donald L McLaughlin, Paul J Beshenich: Vending apparatus price interface. Mars, Davis Hoxie Faithfull & Hapgood, May 19, 1981: US04267915 (10 worldwide citation)

A price interface for use in connecting a calculating and control unit with a multiprice vending apparatus, the price interface including a first register for storing the initial price value during a vending cycle and a second register for storing the current price value during the vending cycle.