US Patent 4,794,789
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
The Rapid Sediment Analyzer provides information on the size distribution of a sample of finely divided particulate matter (e.g. sand) by monitoring the weight and the rate with which the particles fall through a column of liquid (e.g. water). A digital computer connected to the Analyzer reports the particle size distribution directly.
Natako, Tatsuaki Rapid sediment analyzer. US Patent 4,794,789 filed December 07, 1987 and issued January 03, 1989. https://ir.uiowa.edu/patents/62