# US 2021/0274864 A1 · Mask > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0274864 A1 - Document ID: US20210274864A1 - Status: Published application - Kind: A1 - Application number: 17/272,953 - Filed: 2019-08-28 - Published: 2021-09-09 - Earliest claimed: 2018-09-04 - Assignees: 3M Innovative Properties Company - Applicants: 3M Innovative Properties Company - Inventors: Jin-Ho Lee; Jungchul Moon; Jung Han Kim - Web page: https://patentgrep.com/patent/US20210274864A1 ## CPC - A41D 13/1161: {Means for fastening to the user's head} - A41D 13/1146: {obtained by moulding} - A44B 11/04: without movable parts - A62B 18/084: {Means for fastening gas-masks to heads or helmets} - A62B 23/025: {the filter having substantially the shape of a mask (surgical face masks A41D13/11)} - A41D: OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES - A44B: BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE (fastenings specially adapted for footwear A43C) - A62B: DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING (valves specially adapted for medical use A61M39/00; life-saving devices, apparatus or methods specially adapted for use in water B63C9/00; divers' equipment B63C11/00; specially adopted for use with aircraft, e.g. parachutes, ejector seats, {B64D17/00, B64D25/10}; rescue devices peculiar to mining E21F11/00) ## Abstract A mask according to an embodiment of the present disclosure includes: a filtering structure configured to perform an air filtering function; a buckle portion coupled to the filtering structure; and a strap connected to the buckle portion and worn on a body of a user, wherein the buckle portion includes: a body coupled to the filtering structure and having openings formed on both sides thereof; and a fixing piece having one side hinged to a sidewall of the opening and gripping the strap, wherein the strap is inserted between a side surface of the fixing piece and a side-wall of the opening to surround at least a part of an outer surface of the fixing piece, and slidably moves in one direction or both directions in the buckle portion selectively according to a shape of surrounding the fixing piece. ## Claims ### Claim 1 A mask comprising: a filtering structure configured to perform an air filtering function; a buckle portion coupled to the filtering structure; and a strap connected to the buckle portion and worn on a body of a user, wherein the buckle portion comprises: a body coupled to the filtering structure and having openings formed on both sides thereof; and a fixing piece having one side hinged to a sidewall of the opening and gripping the strap, wherein the strap is inserted between a side surface of the fixing piece and a sidewall of the opening to surround at least a part of an outer surface of the fixing piece, and slidably moves in one direction or both directions selectively according to a shape of surrounding the fixing piece. ### Claim 2 (depends on 1) The mask of claim 1, wherein, when one portion of the strap passing between a side surface of one side of the fixing piece and a sidewall of the opening facing each other, and the other portion of the strap passing between a side surface of the other side of the fixing piece and a sidewall of the opening facing each other are positioned on one side and the other side, respectively, with reference to the fixing piece, the strap is slidably movable in one direction in the buckle portion, and wherein, when one portion of the strap passing between the side surface of one side of the fixing piece and the sidewall of the opening facing each other, and the other portion of the strap passing between the side surface of the other side of the fixing piece and the sidewall of the opening facing each other are positioned on a same side with reference to the fixing piece, the strap is slidably movable in both directions in the buckle portion. ### Claim 3 (depends on 1) The mask of claim 1, wherein a saw-toothed portion protrudes from an outer surface of the fixing piece. ### Claim 4 (depends on 3) The mask of claim 3, wherein the saw-toothed portion is inclined forward from at least one side surface of a side surface of one side of the fixing piece and a side surface of the other side of the fixing piece. ### Claim 5 (depends on 3) The mask of claim 3, wherein the saw-toothed portion is inclined backward from a front surface of the fixing piece. ### Claim 6 (depends on 3) The mask of claim 3, wherein a distance between an end of the saw-toothed portion and the sidewall of the opening is shorter than a thickness of the strap. ### Claim 7 (depends on 1) The mask of claim 1, wherein a bonding portion protrudes from one surface of the body facing the filtering structure to be bonded to the filtering structure by ultrasonic bonding. ### Claim 8 (depends on 1) The mask of claim 1, wherein one side of the strap is inserted between the fixing piece and the opening which are disposed on one side of the buckle portion, and wherein the other side of the strap is inserted between the fixing piece and the opening which are disposed on the other side of the buckle portion. ### Claim 9 (depends on 1) The mask of claim 1, wherein a seating portion protrudes from a sidewall of the opening facing a free end of the other side of the fixing piece to have the free end seated thereon. ### Claim 10 (depends on 9) The mask of claim 9, wherein an inclined portion is formed on a front surface of the free end to make a thickness of the free end gradually reduced toward the outside. ### Claim 11 (depends on 1) The mask of claim 1, wherein the buckle portion and the strap are provided on one side surface of the filtering structure and the other side surface opposite to the one side surface. ### Claim 12 (depends on 1) The mask of claim 1, wherein the buckle portion is integrally formed by injection molding.