Patterson founded a company with William Rae known as The Argonaut Company Ltd. in 1909 Patterson became President and Rae became the secretary-treasure. The company was primarily responsible for developing the site on Bear Creek that became modern Grande Prairie.
In 1911 Patterson erected the first Store building in Grande Prairie the business was known as Paterson & Son as he ran the store and a post office from the same building with his son Jack O. Patterson.
Patterson was elected to the Alberta Legislature in the 1913 Alberta general election. He ran in a hotly 3 way contested race defeating former Member of the Legislative Assembly (MLA) William Bredin and against his former business partner and future MLA William Rae. He served 1 term in the Assembly as a member of the official opposition and did not run for re-election.
- Brad Morrow (2000-04-12). "History of the County of Grande Prairie". Archived from the original on 12 August 2007. Retrieved 2007-08-09.
- I. Campbell. "History of the Peace Region Part 16". Retrieved 2007-08-09.
- "Imperial Order of the Daughters of the Empire - Alphaeus Patterson Chapter fonds". South Peace Regional Archives. Retrieved 2007-08-09.
- "I.O.D.E. Alphaeus Patterson Chapter Science Scholarship". Grande Prairie College. Retrieved 2007-08-09.
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