Question: ANCAP is a state-owned company involved in the production of a basic ingredient of concrete which was patented in what year?

Related documents: [0]  [DOC] ANCAP (Administración Nacional de Combustibles, Alcoholes y Portland) is a state-owned company in Uruguay. It is involved in the production of petroleum products, Portland cement and alcoholic beverages. It operates Uruguay's single oil refinery at La Teja with a capacity of 50000 oilbbl per day. ANCAP has a long-term corporate credit rating 'BB-' with positive outlook by Standard & Poor's. [END] 
[1]  [DOC] Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the mid 19th century, and usually originates from limestone. It is a fine powder, produced by heating limestone and clay minerals in a kiln to form clinker, grinding the clinker, and adding small amounts of other materials. Several types of Portland cement are available. The most common, called ordinary Portland cement (OPC), is grey in colour, but white Portland cement is also available. Its name is derived from its similarity to Portland stone which was quarried on the Isle of Portland in Dorset, England. It was named by Joseph Aspdin who obtained a patent for it in 1824. However his son William Aspdin is regarded as the inventor of "modern" Portland cement due to his developments in the 1840s. [END]  
Answer: 1824
1824