# US 7,611,557 B2 · Reversed pressure relief valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,557 B2 - Document ID: US7611557B2 - Status: Granted - Kind: B2 - Application number: 11/088,678 - Filed: 2005-03-24 - Published: 2006-10-12 - Granted: 2009-11-03 - Earliest claimed: 2005-03-24 - Assignees: Plitek, L.L.C. - Inventors: Karl K. Hoffman - Web page: https://patentgrep.com/patent/US7611557B2 ## CPC - G11B 33/146: {constructional details of filters} - G11B 33/1486: {Control/regulation of the pressure, e.g. the pressure inside the housing of a drive} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A reversed pressure relief valve that is used in connection with a computer hard disk drive so as to vent pressurized gases contained within the disk drive while not permitting debris to enter the drive mechanism or the valve. More specifically, the present invention is a reversed direction valve which includes at least one passageway defined by at least a lifter ring, a dry strap, a pressure sensitive adhesive (“PSA”)/body film and a filter media. ## Claims ### Claim 1 A reversed valve for computer hard disk drives comprising: a filter media layer; a PSA/body film located below said filter media layer, a laminating adhesive partially attaching the filter media to the PSA/body film; a dry strap located below said PSA/body film; dry strap PSA adhesive adhered to the outer ends of the dry strap that attaches a portion of the dry strap to the PSA/body film; a lifter ring located below said dry strap having a ring-shaped configuration that permits gas to penetrate through the center of the ring; lifter ring adhesive on a top surface of said lifter ring that attaches a portion of the lifter ring to the dry strap; a laminating adhesive on a bottom surface of said lifter ring that attaches said reversed valve to a surface. ### Claim 2 (depends on 1) The reversed valve of claim 1, wherein the filter media comprises spun bond polypropylene or equivalent. ### Claim 3 (depends on 2) The reversed valve of claim 2, wherein the filter media is circular shaped. ### Claim 4 (depends on 3) The reversed valve of claim 3, wherein the filter media filters particles down to 0.1 micron in size. ### Claim 5 (depends on 1) The reversed valve of claim 1, wherein the dry strap is configured to permit gases to pass through the lifter ring to the PSA/body film. ### Claim 6 (depends on 5) The reversed valve of claim 5, wherein the dry strap is oblong shaped. ### Claim 7 (depends on 5) The reversed valve of claim 5, wherein the dry strap creates a one-way flow of gas. ### Claim 8 (depends on 1) The reversed valve of claim 1, wherein the lifter ring forms a chamber that permits the dry strap and PSA/body film to close mechanically when absolute pressure is obtained in the chamber. ### Claim 9 (depends on 1) The reversed valve of claim 1, in which the lifter ring is made of a polyolefin type material. ### Claim 10 (depends on 1) The reversed valve of claim 1 wherein the PSA/body film is a pressure sensitive material between around 0.001 inch and 0.005 inch thick. ### Claim 11 A reversed valve for computer hard disk drives comprising: a filter media layer; a PSA/body film positioned below said filter media layer, said PSA/body film being acrylic pressure sensitive material of thickness between around 0.001 to 0.005 inches: a dry strap layer positioned below the filter PSA/body film; a lifter ring layer positioned below the dry strap wherein the lifter ring has an exterior wall and an interior wall; wherein the interior wall of the lifter ring and the dry strap form a chamber that permits gases to flow through the chamber when the pressure is greater than ambient; and prohibits air flow when the pressure is less than or equal to ambient; an adhesive binding the filter media layer, the dry strap and lifter ring together. ### Claim 12 (depends on 11) The reversed valve of claim 11. wherein a first adhesive layer is positioned between the filter media and the PSA/body film and a second adhesive layer is positioned between the dry strap and the lifter ring. ### Claim 13 (depends on 11) The reversed valve of claim 11, wherein the filter media is circular shaped. ### Claim 14 (depends on 11) The reversed valve of claim 11, wherein the filter media filters particles down to 0.1 micron in size. ### Claim 15 (depends on 11) The reversed valve of claim 11, wherein the dry strap is configured to permit gases to pass through the lifter ring to the PSA/body film. ### Claim 16 (depends on 11) The reversed valve of claim 11, wherein the dry strap is oblong shaped. ### Claim 17 (depends on 11) The reversed valve of claim 11, wherein the dry strap creates a one-way flow of gas. ### Claim 18 (depends on 11) The reversed valve of claim 11, in which the lifter ring is made of a polyolefin type material.