Patent · US Active

Filter

US8550092B2 · kind B2 · utility

0Cited by

13References

16Claims

0Family size

Assignee

British American Tobacco (Investments) Limited · GB

Inventors

John Sampson · London, GB
David L. Lewis · London, GB

Key dates

Filing date	Jun 27, 2008
Grant date	Oct 8, 2013
Priority date	—
Expiry date	Jul 9, 2030

Classification

Technology area (CPC A)Human Necessities
CPC primaryA24D3/063
WIPO fieldOther consumer goods
WIPO sectorOther fields

Abstract

A filter for a cigarette comprises a porous filter rod (3) a material sheet (2) wrapped around the filter rod and a cellulose acetate thread (4) formed from substantially uncrimped cellulose acetate filaments. The cellulose acetate thread is positioned within the filter rod and extends along the central axis of the filter rod.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.