Abstract: A pressure cooker includes a container having an upper annular shoulder. A pot is engaged in the container and has an annular flange extended from the upper portion. A cap has a peripheral portion engaged with the annular flange of the pot. A cover is pivotally coupled to the container and may be locked to the container for enclosing the container. The container, the cap and the cover each includes a hollow space for engaging with heat insulating materials. A spring is engaged between the cap and the cover for biasing the cap to enclose the pot.

Abstract: A method for coating a metal cookware includes the steps of (A) cleaning the metal cookware; (B) forming a scratch-resistant oxide film on the cooking surface by anodic oxidation; (C) roughening the scratch-resistant oxide film by blasting to form a roughened surface thereon, the roughened surface having valleys extending into the cooking surface; and (D) applying an anti-stick film of fluorocarbon resin on the roughened surface.