1
Alan J Pitts, Leonard R Case, James E Broaddus: Automatic mixture control apparatus and method. Halliburton Company, James R Duzan, E Harrison Gilbert III, June 25, 1991: US05027267 (44 worldwide citation)

An automatic mixture control apparatus includes a micro-computer-based data acquisition and control device which responds in real time to flowmeter and densimeter signals to control water inlet and bulk cement valves so that a cement slurry is produced at the desired rate and density. The data acqui ...


2
Pitts Alan J, Case Leonard Ray, Broaddus James Everrett: Automatic mixture control apparatus and method.. Halliburton Co, October 3, 1990: EP0390437-A1 (4 worldwide citation)

Solid/liquid mixtures, such as cement, are made to a predetermined density and at a predetermined rate, by controlling the admission of liquid and solid to a conduit (2) using valves (6,8) controlled by a data acquisition and control means (38), utilising a measured flow rate (8) of the liquid (meas ...