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Who patented the process for portland cement in 1824?
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Cement
The cement-making process, from crushing and grinding of raw materials, through roasting of the ground and mixed ingredients, to final cooling and storing of the finished product.
The process for portland cement was patented in 1824 by Joseph Aspdin, a bricklayer from Leeds, England.12
Aspdin named the material "portland cement" because the finished product resembled portland stone, a type of limestone widely used in English architecture. While he is credited with the 1824 patent for this synthetic mixture of limestone and clay, some historians note that his specific product may have been burned too lightly to be considered a true modern portland cement; the actual prototype is often attributed to Isaac Charles Johnson around 1850.12