# US 6,080,457 A · Particulate sorbent smoke filter

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- Number: US 6,080,457 A
- Document ID: US6080457A
- Status: Granted
- Kind: A
- Application number: 07/890,394
- Filed: 1992-05-26
- Granted: 2000-06-27
- Earliest claimed: 1989-09-26
- Assignees: Cigarette Components Limited
- Inventors: John Charlton; Paul Francis Clarke; Ernest Brian Hayes
- Web page: https://patentgrep.com/patent/US6080457A

## CPC

- A24D 3/08: of organic materials as carrier or major constituent (of ion exchange materials A24D3/12)
- A24D 3/048: {containing additives}
- A24D 3/163: {Carbon}
- Y10T 428/1369: Fiber or fibers wound around each other or into a self-sustaining shape [e.g., yarn, braid, fibers shaped around a core, etc.]
- Y10T 428/139: Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T 428/1393: Multilayer [continuous layer]
- A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A smoke filter consists of substrate threads and/or strips each pre-coated with particulate sorbent (e.g. activated carbon granules), gathered together in solid or tubular rod form e.g. within a containing sleeve. When the gathered threads and/or strips form a tubular body, this may be provided with a core.

## Claims

### Claim 1

A filter element consisting essentially of up to 20 longitudinally aligned substrate threads, and particulate sorbent in an amount in the range of 0.25 to 2.0 milligrams per millimeter of each substrate thread, each said substrate thread being substantially uniformly individually pre-coated with said particulate sorbent adhering thereto and gathered together and held in rod form.

### Claim 2 (depends on 1)

A filter element according to claim 1 wherein the number of substrate threads consists of up to 15 substrate threads.

### Claim 3

A filter element consisting essentially of up to 20 longitudinally aligned substrate threads, and particulate sorbent in an amount in the range of 0.25 to 2.0 milligrams per millimeter of each substrate thread, each said substrate thread being substantially uniformly individually pre-coated with said particulate sorbent adhering thereto and gathered together and held in tube form.

### Claim 4 (depends on 3)

A filter element according to claim 3 wherein the number of substrate threads consists of up to 15 substrate threads.

### Claim 5

A filter element comprising particulate sorbent and up to 15 longitudinally aligned substrate threads, said particulate sorbent being present in an amount in the range of 0.25 to 2 milligrams per millimeter of each substrate thread, said substrate threads being substantially uniformly individually pre-coated with said particulate sorbent adhering thereto and gathered together and held in rod form or in tube form.

### Claim 6 (depends on 5)

A filter element according to claim 5 which is a tube component in a composite filter product in the form of a tube around a core.

### Claim 7 (depends on 5)

The filter element according to claim 5 having up to 10 substrate threads.

### Claim 8 (depends on 5)

The filter element according to claim 5 wherein said particulate sorbent comprises activated carbon granules.