# US 11,299,884 B2 · Fire-resistant mullion sealer

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- Number: US 11,299,884 B2
- Document ID: US11299884B2
- Status: Granted
- Kind: B2
- Application number: 16/791,017
- Filed: 2020-02-14
- Published: 2020-08-20
- Granted: 2022-04-12
- Earliest claimed: 2019-02-14
- Assignees: Specified Technologies Inc.
- Applicants: Specified Technologies Inc.
- Inventors: James P. Stahl, Jr.; Paul J. Gandolfo
- Web page: https://patentgrep.com/patent/US11299884B2

## CPC

- E04B 1/947: {by closing openings in walls or the like in the case of fire (fire-proof doors E06B5/16)}
- E04B 2/96: comprising panels attached to the structure through mullions or transoms {(E04B2/885 takes precedence)}
- E04B 2/967: {Details of the cross-section of the mullions or transoms (E04B2/965 takes precedence)}
- E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001})

## Abstract

A sealing plug configured for sealing a passage of a curtain wall mullion. The passage has a maximum width and a length. The sealing plug includes a main body extending from a first surface to a second surface. The main body has a width at least as large as the passage maximum width and a length at least as large as the passage length. The main body is manufactured from a compressible foam. An intumescent layer is defined along at least one of the first and second surfaces.

## Claims

### Claim 1

A sealing plug configured for sealing a passage of a curtain wall mullion, the passage having a maximum width and a length, the sealing plug comprising:
a main body extending from a first surface to a second surface and having a width at least as large as the passage maximum width and a length at least as large as the passage length, the main body manufactured from a compressible foam; and
an intumescent layer extending along at least one of the first and second surfaces,
wherein the main body has a height and the intumescent layer height is significantly less than the height of the main body.

### Claim 2 (depends on 1)

The sealing plug according to claim 1 wherein the main body width is larger than the passage maximum width and the main body length is larger than the passage length.

### Claim 3 (depends on 1)

The sealing plug according to claim 1 wherein the compressible foam is elastic.

### Claim 4 (depends on 1)

The sealing plug according to claim 1 wherein the compressible foam is manufactured from a fire-retardant material.

### Claim 5 (depends on 1)

The sealing plug according to claim 1 wherein the intumescent layer is manufactured from a resilient foam.

### Claim 6 (depends on 1)

The sealing plug according to claim 1 wherein an intumescent layer extends along both of the first and second surfaces.

### Claim 7

A sealed mullion assembly comprising:
a curtain wall mullion defining a passage therethrough having a maximum width and a length; and
a sealing plug positioned in the curtain wall mullion passage and comprising:
a main body extending from a first surface to a second surface and having a width at least as large as the passage maximum width and a length at least as large as the passage length, the main body manufactured from a compressible foam; and
an intumescent layer extending along at least one of the first and second surfaces,
wherein the main body has a height and the intumescent layer height is significantly less than the height of the main body.

### Claim 8 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the main body width is larger than the passage maximum width and the main body length is larger than the passage length.

### Claim 9 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the compressible foam is elastic.

### Claim 10 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the compressible foam is manufactured from a fire-retardant material.

### Claim 11 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the intumescent layer is manufactured from a resilient foam.

### Claim 12 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the passage has an open end and the sealing plug is positioned such that the intumescent layer faces toward the open end.

### Claim 13 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the passage has an open end and the sealing plug is positioned such that the intumescent layer faces away from the open end.

### Claim 14 (depends on 7)

The sealed mullion assembly according to claim 7 wherein an intumescent layer is extends along both of the first and second surfaces.

### Claim 15 (depends on 7)

The sealed mullion assembly according to claim 7 wherein the curtain wall mullion has an expandable width.