# US 6,302,114 B1 · Tobacco smoke filter

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- Number: US 6,302,114 B1
- Document ID: US6302114B1
- Status: Granted
- Kind: B1
- Application number: 07/960,737
- Filed: 1992-10-14
- Granted: 2001-10-16
- Earliest claimed: 1991-10-14
- Assignees: Cigarette Components Limited
- Inventors: Paul Francis Clarke; John Charlton
- Web page: https://patentgrep.com/patent/US6302114B1

## CPC

- A24D 3/14: of organic materials as additive (of ion exchange materials A24D3/12)
- A24B 15/282: {by indirect addition of the chemical substances, e.g. in the wrapper, in the case}
- A24D 3/048: {containing additives}
- A24D 3/16: of inorganic materials
- A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24B: MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF

## Abstract

The present invention provides a tobacco smoke filter or filter element having a longitudinally extending core (2) and a wrapper (4) engaged around the core (2), the wrapper (4) having particulate additive (6) adhered to one or more portion(s) of the radially inner face thereof with said wrapper (4) being free of additive around its circumference at one or both ends of the core.

## Claims

### Claim 1

A tobacco smoke filter or filter element comprising a longitudinally extending core and a wrapper engaged around the core from end to end, wherein said wrapper having a radial inner face to which particulate additive adhere at one or more portion(s) thereof and having a circumference free of said additive at one or both ends of the core.

### Claim 2 (depends on 1)

A filter or filter element according to claim 1 wherein the core has grooves extending longitudinally over a part of its length, particulate additive adhered to the radially inner face of the wrapper exending into the grooves.

### Claim 3 (depends on 1)

A filter or filter element according to claim 1 wherein the wrapper has grooves extending longitudinally over a part of its length, particulate additive being adhered to the radially inner face of the wrapper at an ungrooved region thereof.

### Claim 4 (depends on 1, 2, 3)

A filter element according to any one of claims 1-3 wherein the wrapper is itself surrounded by an outer tubular body.

### Claim 5 (depends on 4)

A filter or filter element according to claim 4 further comprising an additional outer sleeve surrounding said tubular body.

### Claim 6

A filter cigarette comprising a filter or filter element, said filter or filter element comprises a longitudinally extending core and a wrapper engaged around the core from end to end, said wrapper having a radial inner face to which particulate additive adhere at one or more portion(s) thereof and having a circumference free of said additive at one or both ends of the core.

### Claim 7

A multiple length rod comprising a plurality of filter or filter elements joined integrally end to end in mirror image relation, wherein said filter or filter element comprises a longitudinally extending core and a wrapper engaged around the core from end to end, said wrapper having a radial inner face to which a particulate additive adhere at one or more portion(s) thereof and having a circumference free of said additive at one or both ends of the core.

### Claim 8

A method of making a smoke filter or element which comprises continuously advancing a continuous core and a continuous strip having particulate additive adhered to a face thereof at longitudinally spaced regions, continuously wrapping the advancing strip around the advancing core (optionally simultaneously with core formation) with particulate additive against the core, and cutting the resulting continuously produced wrapped core into finite length.