# US 4,774,972 A · Ventilated tobacco smoke filter

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- Number: US 4,774,972 A
- Document ID: US4774972A
- Status: Granted
- Kind: A
- Application number: 06/846,158
- Filed: 1986-03-31
- Granted: 1988-10-04
- Earliest claimed: 1985-04-22
- Assignees: Cigarette Components Limited
- Inventors: Ernest B. Hayes
- Web page: https://patentgrep.com/patent/US4774972A

## CPC

- A24D 3/043: {with ventilation means, e.g. air dilution (A24D3/041 takes precedence)}
- A24D: CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES OF CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES

## Abstract

A tobacco smoke filter having a non-integral core of components [2, 3] joined and held in longitudinal alignment by a strip [1] which extends only partially around the core circumference to leave a gap [7] extending longitudinally of the core between the longitudinal edges [8] of the strip, and an outer wrap [5] which engages fully around the core and strip and provides--e.g. via perforations [9]--for the lateral ingress of external ventilating air therethrough and through the longitudinal gap.

## Claims

### Claim 1

A tobacco smoke filter rod of finite length having an elongate non-integral core of components joined and held in longitudinal alignment by one or more strips each extending along and only partially around the core circumference to leave at least one gap extending longitudinally the full length of the core between longitudinal strip edges and through which the core is exposed to ambient air so that ventilating air may enter the core laterally.

### Claim 2 (depends on 1)

A filter rod according to claim 1 having such strips in the form of circumferentially spaced threads, strings or fine rods.

### Claim 3 (depends on 1)

A filter rod according to claim 1 wherein adjacent core components differ.

### Claim 4 (depends on 1)

A filter rod according to claim 1 wherein adjacent core components are spaced apart.

### Claim 5 (depends on 1)

A filter comprising a filter rod according to claim 1 having an outer wrap which engages fully around the core and the one or more strips and provides for lateral ingress of external ventilating air therethrough and through said longitudinal gap.

### Claim 6 (depends on 5)

A filter according to claim 5 wherein longitudinally adjacent core components are spaced apart and the outer wrap has ventilating perforations in register with the space between adjacent core components.

### Claim 7 (depends on 5)

A filter according to claim 5 wherein the outer wrap is a tipping overwrap incorporating the filter in a filter cigarette.

### Claim 8

A tobacco smoke filter having a non-integral core of components joined and held in longitudinal alignment by plugwrap which extends only partially around the core circumference to leave a gap extending longitudinally the full length of the core between the longitudinal edges of the plugwrap, and an outer wrap which engages fully around the core and plugwrap and provides for the lateral ingress of external ventilating air therethrough and through the longitudinal gap.

### Claim 9

A tobacco smoke filter rod of finite length having a non-integral core of components joined and held in longitudinal alignment by plugwrap which extends only partially around the core circumference to leave a gap which extends longitudinally the full length of the core between the longitudinal edges of the plugwrap and through which the core is exposed to ambient air so that ventilating air may enter the core laterally.