Treatise on the patent law of the Dominion of Canada : including the revised Patent Act, as amended to date with annotations : the Patent office rules and forms, general forms, and forms relating to practice in the Exchequer Court of Canada, etc. / by John G. Ridout, (late C.E.), barrister, soliciter, etc., of the firm of Ridout and Maybee, solicitors of patents and experts, of the City of Toronto, Canada