# US 8,541,696 B2 · EMI-shielding solutions for computer enclosures using combinations of two and three-dimensional shapes formed in sheet metal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,696 B2 - Document ID: US8541696B2 - Status: Granted - Kind: B2 - Application number: 12/523,414 - Filed: 2008-10-22 - Published: 2010-08-12 - Granted: 2013-09-24 - Earliest claimed: 2007-10-22 - Assignees: Stealthdrive, Inc. - Applicants: Paul Douglas Cochrane - Inventors: Paul Douglas Cochrane - Web page: https://patentgrep.com/patent/US8541696B2 ## CPC - H05K 9/0009: {with provisions to reduce EMI leakage through the joining parts} - H05K 9/0007: {Casings (standardised racks H05K9/0062)} - H05K 9/0049: {being metallic containers} - H05K 9/0073: {Shielding materials (H05K9/0003 takes precedence)} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract The present invention provides a configuration of a computer-chassis containment or other electromagnetic device method for manufacture in which a “one-hit” solution may be implemented to provide adequate electromagnetic interference shielding (EMC shielding) and is configured such that shielding gaskets, “spoons” or other excessive structures may be reduced or eliminated completely. Patterned sinusoidal “patterns” that are stamped, molded, cut, or extruded into one or more sides of a “box” provide sufficient EMI shielding, such that the need for gaskets is reduced or eliminated. ## Claims ### Claim 1 A computer enclosure including: a first sheet made of at least partially-conductive material, in which at least four sides are made of a single sheet; and a second sheet, said second sheet providing at least one additional side; in which a -channel including a semi-cylinder is formed into each of said first sheet and said second sheet, such that said three-dimensional channel in said second sheet mates with said channel in said first sheet in the semi-cylinder wherein a curvilinear interface is formed between said two surfaces in said channels including a gap portion and a contact portion, said gap portion providing capacitance and said contact portion providing conductance for EMI containment. ### Claim 2 (depends on 1) The enclosure as recited in claim 1, wherein the at least partially-conductive material is mild steel. ### Claim 3 (depends on 1) The computer enclosure recited in claim 1, wherein there is electrical contact along two at least partial lines longitudinally between said first and second channels, said contact configured in said semi-cylinders. ### Claim 4 An enclosure for electronics formed from at least a first conductive sheet and a second conductive sheet, where said first conductive sheet includes a formed continuous semi-cylindrical channel mated into a continuous semi-cylindrical channel formed into said second conductive sheet, wherein a curvilinear interface is formed between said mating of said first semi-cylindrical channel and said second semi-cylindrical channel, said curvilinear interface including a gap portion and a contact portion and said gap portion providing capacitance and said contact portion providing conductance where said semi-cylindrical channels contact each other. ### Claim 5 (depends on 4) The enclosure as recited in claim 4, wherein said semi-cylindrical channels contact each other along a single line along said semi-cylindrical channels. ### Claim 6 (depends on 4) The enclosure as recited in claim 4, wherein said semi-cylindrical channels contact each other along two lines of said semi-cylindrical channels. ### Claim 7 (depends on 4) The enclosure as recited in claim 4, wherein said contact is provided by a single line with multiple points of contact. ### Claim 8 (depends on 4) The enclosure as recited in claim 4, wherein said contact is provided by at least two lines with multiple points of contact. ### Claim 9 (depends on 4) The enclosure as recited in claim 4, wherein said semi-cylindrical channels are configured such that when placed in mating position, compression is provided which keeps said first and said conductive sheets in position. ### Claim 10 (depends on 4) The enclosure as recited in claim 4, where in said sheets are conductive or semi-conductive. ### Claim 11 An enclosure for providing improved electromagnetic interference (EMI) shielding, including two conductive sheets, each formed with a semi-cylindrical channel running the length of a least one side and configured such that one of said semi-cylindrical channels is nested inside said other semi-cylindrical channel, and including at least one contact line or multiple points of contact between said nested semi-cylindrical channels, wherein said surface properties formed by said nested semi-cylindrical channels, include a gap portion and a contact portion, said gap portion providing capacitance and said contact portion providing conductance, said conductance and capacitance dissipating energy in the form of thermal heat. ### Claim 12 (depends on 11) The enclosure as recited in claim 11, wherein there are a least two contact lines. ### Claim 13 (depends on 11) The enclosure as recited in claim 11 wherein said conductive sheet is mild steel.