Patent ID: 11930956
Assignee: ALL-CLAD METALCRAFTERS, L.L.C.
Field: Surface technology, coating (Chemistry)
Classification: CPC A  B | IPC A  B

Claim 12:
13. A method of making cookware, the method comprising:
(a) providing a first metal layer;
(b) providing a perforated graphite layer having a thickness of at least 0.010 in. (0.254 mm) and a plurality of spaced-apart holes formed therethrough,
(c) providing a second metal layer having a cavity with a plurality of spaced-apart posts protruding from a bottom surface of the cavity, the second metal layer made of aluminum;
(d) providing a third metal layer;
(e) stacking the layers provided in (a)-(d) in a blank assembly such that the perforated graphite layer is received within the cavity of the second metal layer whereby the plurality of posts of the second metal layer are aligned with and pass through the plurality of holes in the perforated graphite layer such that a lower surface of the first metal layer contacts at least an upper surface of upper end portions of the plurality of posts, and such that the third layer is positioned opposite a planar side of the second metal layer opposite the cavity; and
(f) pressing the blank assembly by applying a force in a direction perpendicular to a plane of the layers in the blank assembly and concurrently heating the blank assembly to achieve a metallurgical bond between the first metal layer and the second metal layer and between the second metal layer and the third metal layer to provide a bonded blank assembly.