West Torrens were seeking consecutive T20 titles, however Kensington were out to redeem themselves after last season's final defeat.
Supported by fellow opener Eliza Doddridge (30 not out from 28 balls), Patterson struck a powerful 54 from just 39 balls to chase the required total in the 12th over.
West Torrens won the toss and elected to bat first, however early and frequent wickets saw the Eagles struggle to create a partnership.
Caroline Ward (23 not out from 41 balls), complemented by Ellie Falconer (19 from 21 balls) and Kayla McGrath (18 from 24 balls) managed to compile just 6/88 after their 20 overs.
Sarah-Jane Jameson was the pick of the Browns’ bowlers with 2/18 from four overs.
In reply, Patterson and Doddridge carried their bats to cruise to an emphatic 10-wicket victory, with Patterson named Player of the Match.