# US 11,998,773 B2 · Filter and mask

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- Number: US 11,998,773 B2
- Document ID: US11998773B2
- Status: Granted
- Kind: B2
- Application number: 15/733,568
- Filed: 2019-03-04
- Published: 2020-12-31
- Granted: 2024-06-04
- Earliest claimed: 2018-03-08
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: HyoungSun Park; Jung Han Kim; Kyungsik Dan
- Web page: https://patentgrep.com/patent/US11998773B2

## CPC

- A62B 23/02: for respirators
- A62B 18/084: {Means for fastening gas-masks to heads or helmets}
- 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 filter according to an embodiment include a filter main body provided with a sheet member, and a border portion of the filter main body includes a first region bent at least one time, and a second region formed in a flat shape and provided to be bendable and to provide softness to the filter main body.

## Claims

### Claim 1

A filter comprising a filter main body having a first major surface and a second major surface opposite the first major surface, the filter main body comprising an inside portion and a border portion bordering the inside portion, wherein the inside portion comprises a sheet member bent with overlapping bends to form a first region associated with the first major surface, and a second region associated with the second major surface;
wherein the first region comprises a plurality of first region pieces separated by overlapping bends in the sheet member, wherein the filter further comprises discrete convex portions associated with first region pieces protruding from the first major surface, and the second region comprises a plurality of second region pieces associated with the second major surface, and wherein the second major pieces are positioned between the bends that separate the first region pieces.

### Claim 2 (depends on 1)

The filter of claim 1, wherein the sheet member is formed with a multi-layered structure in which a plurality of sheets are stacked one on another.

### Claim 3 (depends on 1)

The filter of claim 1:
wherein a distance between the first region pieces disposed adjacent to each other increases as the filter main body is bent so as to compress the second major surface.

### Claim 4 (depends on 1)

The filter of claim 1, further comprising:
second convex portions associated with the second region pieces and protruding from the second major surface.

### Claim 5 (depends on 4)

The filter of claim 4:
wherein the first region pieces are individually symmetrically formed with respect to a vertical axis perpendicular to the filter main body.

### Claim 6 (depends on 5)

The filter of claim 5, wherein convex portions associated with the first region pieces have a thickness that is thinner than a thickness convex portions associated with the second region pieces.

### Claim 7 (depends on 1)

The filter of claim 1, wherein the first region and the second region are formed by fusing the border portion by at least one fusion method selected from the following: thermal fusion, laser fusion, ultrasonic fusion, vibration fusion, and infrared fusion.

### Claim 8 (depends on 1)

A mask comprising:
a filter according to claim 1;
a filter case accommodating the filter; and
a main body to which the filter case is coupled and which is provided to be wearable on a user's face.

### Claim 9 (depends on 8)

The mask of claim 8, wherein the filter is formed in any one shape of a circular shape and a polygonal shape.

### Claim 10 (depends on 8)

The mask of claim 8, wherein the filter case comprises:
a base member coupled to the main body; and
a cover member pivotably coupled to the base member.

### Claim 11 (depends on 8)

The mask of claim 8:
further comprising a support member supporting the filter and accommodated in a base member,
wherein the support member is over-molded along a border portion of the filter.