Ponoka-Calmar Oils v Wakefield[1] is notable for being the last ruling rendered by the Judicial Committee of the Privy Council with respect to an appeal from the courts of Canada.

On 19 September, Harding and McMullen incorporated Oil City Petroleums (Leduc) Ltd., which entered into a formal contract with Wakefield on the matter.

In June 1950, a receiver was appointed to sell the oil won, and, subject to stated deductions, to deposit the proceeds in a special trust account to the credit of the action.

held that if such liens did arise they had ceased to exist before the date of the trial of the action, by reason of the failure of the appellant to file a renewal statement as required by the Act.

Because of the nature of the agreements that had been executed, both appellants were considered to be "owners" within the meaning of the Alberta Act, and were thus included within the liability for the liens that had attached.