Ventilated Filter And Smoke Dispersing Mouthpiece

What is this patent about?

'996 is related to the field of cigarette filters, specifically addressing the problem of delivering filtered and ventilated smoke to the smoker while maintaining a desirable draw effort and taste perception. The background acknowledges the use of ventilation to dilute smoke and reduce tar, but highlights the need for improved designs that effectively mix air and smoke and enhance the smoker's experience.

The underlying idea behind '996 is to use a combination of nozzles and capillaries within the mouthpiece to control the flow of diluted smoke. A converging nozzle accelerates the smoke, followed by a short capillary and a diverging nozzle to decelerate it, creating turbulence. Simultaneously, multiple capillaries deliver smoke directly to the mouth end, mixing with the turbulent flow from the nozzle.

The claims of '996 focus on a filter device comprising a porous filter rod and a smoke-impermeable mouthpiece. The mouthpiece incorporates a converging nozzle, a diverging nozzle downstream of the converging nozzle, a short smoke flow capillary connecting the nozzles, and a plurality of longitudinal smoke flow capillaries. The tipping material circumscribing the filter rod and mouthpiece is air permeable over at least a portion of the filter rod.

In practice, as a smoker draws, air enters the filter rod through perforations in the tipping material, diluting the smoke. This diluted smoke then enters both the converging nozzle and the longitudinal capillaries. The nozzle accelerates and then decelerates the smoke, creating a turbulent flow. The capillaries deliver smoke directly to the mouth, where it mixes with the turbulent flow, ensuring a wide dispersion of the diluted smoke.

This design differentiates itself from prior art by creating a specific flow pattern within the mouthpiece. The combination of the converging/diverging nozzle and the multiple capillaries is intended to enhance the smoker's perception of taste. The turbulent flow from the nozzle is designed to stir the smoke from the capillaries, ensuring that it reaches the smoker's taste buds effectively, while the air-permeable tipping material allows for ventilation and tar reduction.