# US 2013/0240232 A1 · Stretchable protection cover > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0240232 A1 - Document ID: US20130240232A1 - Status: Published application - Kind: A1 - Application number: 13/420,708 - Filed: 2012-03-15 - Published: 2013-09-19 - Earliest claimed: 2012-03-15 - Assignees: Danfoss PolyPower A/S - Inventors: Mohamed Yahia Benslimane - Web page: https://patentgrep.com/patent/US20130240232A1 ## CPC - F16J 15/104: {characterised by structure} - F16J 15/108: {Special methods for making a non-metallic packing} - B32B 3/30: characterised by a layer formed with recesses or projections, e.g. {hollows, grooves, protuberances, ribs (apertured layer B32B3/266; layer with cavities or internal voids B32B3/26)} - Y10T 428/24537: Parallel ribs and/or grooves - F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention relates to a stretchable protection cover to protect mainly dynamic bodies, such as transducers, from being affected by particles in the environment where the dynamic bodies operate. The protection cover is formed of composites comprising a film of an elastic material having a surface with raised and depressed surface portions, and a barrier layer positioned onto this surface in a manner where the barrier layer takes form of the film surface. In one specific embodiment such composites further are used to form ring-shaped structures utilizable as O-rings. ## Claims ### Claim 1 A protection cover formed from at least one composite comprising: a film made of a polymeric material and having a first surface and second surface, and a first barrier layer being deposited onto at least the first surface where the composite first surface is provided with a pattern of raised and depressed surface portions and where the barrier layer is formed according to the pattern. ### Claim 2 (depends on 1) The protection cover according to claim 1, wherein the barrier layer has a modulus of elasticity being higher than the modulus of elasticity of the film. ### Claim 3 (depends on 2) The protection cover according to claim 2, wherein the barrier layer comprises plastics, clays, glass, ceramics, metal material, alloy of metals and/or just mixture of metals. ### Claim 4 (depends on 3) The protection cover according to claim 3, wherein the barrier layer comprises a mixture of said materials. ### Claim 5 (depends on 1) The protection cover according to claim 1, wherein at least one composite is wrapped at least one time around a dynamic body. ### Claim 6 (depends on 5) The protection cover according to claim 5, wherein the at least one end portion of the composites extends beyond the end of the dynamic body and where at least a section of end portion is rolled in the direction of a first line towards the dynamic body. ### Claim 7 (depends on 6) The protection cover according to claim 6, comprising a plurality of individual composites and wherein some form a first group having at least a section of their end portion rolled with a first angular direction in the direction of a first line towards the dynamic body. ### Claim 8 (depends on 7) The protection cover according to claim 7, wherein other composites form a second group having at least a section of their end portion rolled with a second angular direction in the direction of a first line towards the dynamic body. ### Claim 9 (depends on 8) The protection cover according to claim 8, wherein first and/or second super-groups are formed by rolling first and/or second groups with a first angular direction or a second angular direction in the direction of a first line towards the dynamic body in any number and permutation thereof. ### Claim 10 (depends on 6) The protection cover according to claim 6, wherein the end portion of the composites extends beyond the end of the dynamic body is flattened out, and this flattened structure of composite(s) is then rolled in the direction of a first line towards the dynamic body. ### Claim 11 (depends on 1) The protection cover according to claim 1, wherein the surface pattern is corrugated where the raised and depressed surface portions forming waves with troughs and crests extending in essentially one common direction, each wave defining a height being a shortest distance between a crest and neighbouring troughs, such that it has a compliance direction which is at least 50 times larger than the compliance in a direction being at least substantially perpendicular to the compliance direction. ### Claim 12 (depends on 1) The protection cover according to claim 1, wherein the protection cover comprises a plurality of composites, and where at least one composite consists of materials of the barrier layer being different from at least one other of said composites. ### Claim 13 (depends on 2) A transducer covered by the protection cover according to claim 2, wherein the transducer is the dynamic body and is formed of similar composites as the protection cover, comprising: a film made of a dielectric material and having a first surface and second surface, at least the first surface comprising a surface pattern of raised and depressed surface portions, and a first electrically conductive layer being deposited onto the surface pattern, the electrically conductive layer having a corrugated shape which is formed by the surface pattern of the film. ### Claim 14 (depends on 13) The transducer according to claim 13, wherein the materials constituting the composite(s) of the transducer are the same as the materials constituting the composite(s) of the protection cover. ### Claim 15 (depends on 1) An O-ring formed from composite(s) according to claim 1, and wherein the composite(s) are rolled into any number and permutation of first groups, second groups, first super-groups and/or second super-groups until they form a ring-shaped like structure.