Diamond Shamrock
US oil refinery and gas station company / From Wikipedia, the free encyclopedia
This article is about the company. For the building formerly known as the Diamond Shamrock Building, see 1100 Superior.
Diamond Shamrock Corp. or Diamond Shamrock Refining and Marketing was an oil refinery and gas station company in the United States, headquartered in San Antonio, Texas.
Quick Facts Formerly, Industry ...
Formerly | Diamond Alkali, Shamrock Oil and Gas, and Sigmor |
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Industry | Oil, gas, chemicals |
Founded | 1910 (1910) in Pittsburgh, Pennsylvania (as Diamond Alkali) August 29, 1929 (1929-08-29) (as Shamrock Oil and Gas) 1967 (1967) (as Diamond Shamrock) |
Founders | John Sheerin, TR Evans, Thomas E. Turner |
Fate | Acquired by Valero Energy Corporation |
Headquarters | San Antonio , Texas |
Area served | California, Colorado, Georgia, New Mexico, Oklahoma, South Carolina, Texas |
Website | www |
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Since 2001, it operates as a brand of Valero and has withdrawn the brand from a majority of Texas gas stations and had converted most of the stores to Valero or sold them off to Texaco or other companies.