Perforated substrate and method of manufacture
AssigneePrecious Plate Florida
InventorsCarlton G. Jenkins, David R. Hurst
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Abstract
A perforated substrate having half of the perforations formed from one major surface of the substrate and the other half formed from the opposite major surface, the two major surface being coplanar is described. This introduces equal and opposite stress forces into the substrate which essentially cancel each other and provide a product meeting exacting planarity requirements.
Claims27
A perforated and substantially planar substrate comprising coplanar first and second major surfaces, each major surface having a similar pattern of stress regions provided by each perforation formed having a portion of the substrate surrounded by the stress region removed therefrom, the perforations having an alternating configuration from one surface to the other between immediately adjacent stress regions along any direction of either of the surfaces to introduce equal and opposite stress forces into the substrate that essentially cancel each other to provide the planar characteristic to the perforated substrate.
A perforated and substantially planar substrate comprising coplanar first and second major surfaces, wherein each major surface has a similar pattern of perforations, each perforation punched therein from one of the surfaces and extending through the other surface in an alternating configuration from one surface to the other between immediately adjacent perforations along any direction of either of the surfaces to introduce equal and opposite stress forces provided by each perforation formed having a portion of the substrate surrounded by the stress forces removed therefrom, the stress forces essentially cancelling each other to provide the planar characteristic to the perforated substrate.
A perforated and substantially planar substrate comprising coplanar first and second major surfaces, wherein each major surface has a similar pattern of perforations, each perforation beginning at one of the surfaces and extending through the other surface in an alternating configuration from one surface to the other between immediately adjacent perforations along any direction of either of the surfaces to introduce equal and opposite stress forces provided by each perforation formed having a portion of the substrate surrounded by the stress forces removed therefrom, the stress forces essentially cancelling each other to provide the planar characteristic to the perforated substrate.
Dependencies are inferred from the claim text.